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# CVE ID CWE ID # of Exploits Vulnerability Type(s) Publish Date Update Date Score Gained Access Level Access Complexity Authentication Conf. Integ. Avail.
1 CVE-2021-43546 1021 2021-12-08 2022-03-16
4.3
None Remote Medium Not required None Partial None
It was possible to recreate previous cursor spoofing attacks against users with a zoomed native cursor. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
2 CVE-2021-43545 834 2021-12-08 2022-02-28
4.3
None Remote Medium Not required None None Partial
Using the Location API in a loop could have caused severe application hangs and crashes. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
3 CVE-2021-43543 79 XSS 2021-12-08 2022-03-16
4.3
None Remote Medium Not required None Partial None
Documents loaded with the CSP sandbox directive could have escaped the sandbox's script restriction by embedding additional content. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
4 CVE-2021-43542 209 2021-12-08 2022-03-16
4.3
None Remote Medium Not required Partial None None
Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages for loading external protocols. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
5 CVE-2021-43541 2021-12-08 2022-03-16
4.3
None Remote Medium Not required None Partial None
When invoking protocol handlers for external protocols, a supplied parameter URL containing spaces was not properly escaped. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
6 CVE-2021-43540 732 2021-12-08 2022-03-16
4.3
None Remote Medium Not required None Partial None
WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.
7 CVE-2021-43539 416 2021-12-08 2022-03-16
6.8
None Remote Medium Not required Partial Partial Partial
Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC occurring within the call not tracing those live pointers. This could have led to a use-after-free causing a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
8 CVE-2021-43538 362 2021-12-08 2022-03-16
4.3
None Remote Medium Not required None Partial None
By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
9 CVE-2021-43537 704 2021-12-08 2022-03-16
6.8
None Remote Medium Not required Partial Partial Partial
An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
10 CVE-2021-43536 668 2021-12-08 2022-03-16
4.3
None Remote Medium Not required Partial None None
Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the target URL. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
11 CVE-2021-43535 416 Mem. Corr. 2021-12-08 2022-03-17
6.8
None Remote Medium Not required Partial Partial Partial
A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.3, and Firefox ESR < 91.3.
12 CVE-2021-43534 787 Mem. Corr. 2021-12-08 2022-03-17
6.8
None Remote Medium Not required Partial Partial Partial
Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox ESR 91.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
13 CVE-2021-43533 2021-12-08 2021-12-10
4.3
None Remote Medium Not required None Partial None
When parsing internationalized domain names, high bits of the characters in the URLs were sometimes stripped, resulting in inconsistencies that could lead to user confusion or attacks such as phishing. This vulnerability affects Firefox < 94.
14 CVE-2021-43532 601 2021-12-08 2021-12-10
5.8
None Remote Medium Not required Partial Partial None
The 'Copy Image Link' context menu action would copy the final image URL after redirects. By embedding an image that triggered authentication flows - in conjunction with a Content Security Policy that stopped a redirection chain in the middle - the final image URL could be one that contained an authentication token used to takeover a user account. If a website tricked a user into copy and pasting the image link back to the page, the page would be able to steal the authentication tokens. This was fixed by making the action return the original URL, before any redirects. This vulnerability affects Firefox < 94.
15 CVE-2021-43531 346 2021-12-08 2021-12-10
4.3
None Remote Medium Not required Partial None None
When a user loaded a Web Extensions context menu, the Web Extension could access the post-redirect URL of the element clicked. If the Web Extension lacked the WebRequest permission for the hosts involved in the redirect, this would be a same-origin-violation leaking data the Web Extension should have access to. This was fixed to provide the pre-redirect URL. This is related to CVE-2021-43532 but in the context of Web Extensions. This vulnerability affects Firefox < 94.
16 CVE-2021-38509 1021 2021-12-08 2022-03-16
4.3
None Remote Medium Not required None Partial None
Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
17 CVE-2021-38508 1021 2021-12-08 2022-03-16
4.3
None Remote Medium Not required None Partial None
By displaying a form validity message in the correct location at the same time as a permission prompt (such as for geolocation), the validity message could have obscured the prompt, resulting in the user potentially being tricked into granting the permission. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
18 CVE-2021-38507 346 2021-12-08 2022-03-16
4.3
None Remote Medium Not required None Partial None
The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded to TLS while retaining the visual properties of an HTTP connection, including being same-origin with unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port 8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
19 CVE-2021-38506 1021 2021-12-08 2022-02-28
4.3
None Remote Medium Not required None Partial None
Through a series of navigations, Firefox could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
20 CVE-2021-38504 416 Mem. Corr. 2021-12-08 2022-03-16
6.8
None Remote Medium Not required Partial Partial Partial
When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-free could have resulted, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
21 CVE-2021-38503 863 Bypass 2021-12-08 2022-03-16
7.5
None Remote Low Not required Partial Partial Partial
The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
22 CVE-2021-38501 Mem. Corr. 2021-11-03 2021-11-04
6.8
None Remote Medium Not required Partial Partial Partial
Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.
23 CVE-2021-38500 Mem. Corr. 2021-11-03 2022-03-17
6.8
None Remote Medium Not required Partial Partial Partial
Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.
24 CVE-2021-38499 787 Mem. Corr. 2021-11-03 2022-05-03
6.8
None Remote Medium Not required Partial Partial Partial
Mozilla developers reported memory safety bugs present in Firefox 92. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 93.
25 CVE-2021-38498 416 Mem. Corr. 2021-11-03 2021-11-04
5.0
None Remote Low Not required None None Partial
During process shutdown, a document could have caused a use-after-free of a languages service object, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.
26 CVE-2021-38497 346 2021-11-03 2021-11-04
4.3
None Remote Medium Not required None Partial None
Through use of reportValidity() and window.open(), a plain-text validation message could have been overlaid on another origin, leading to possible user confusion and spoofing attacks. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.
27 CVE-2021-38496 416 Mem. Corr. 2021-11-03 2022-03-17
6.8
None Remote Medium Not required Partial Partial Partial
During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.
28 CVE-2021-38494 787 Mem. Corr. 2021-11-03 2022-05-03
6.8
None Remote Medium Not required Partial Partial Partial
Mozilla developers reported memory safety bugs present in Firefox 91. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 92.
29 CVE-2021-38493 787 Mem. Corr. 2021-11-03 2022-05-03
6.8
None Remote Medium Not required Partial Partial Partial
Mozilla developers reported memory safety bugs present in Firefox 91 and Firefox ESR 78.13. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.14, Thunderbird < 78.14, and Firefox < 92.
30 CVE-2021-38491 2021-11-03 2022-03-16
4.3
None Remote Medium Not required None Partial None
Mixed-content checks were unable to analyze opaque origins which led to some mixed content being loaded. This vulnerability affects Firefox < 92.
31 CVE-2021-30547 787 2021-06-15 2022-02-28
6.8
None Remote Medium Not required Partial Partial Partial
Out of bounds write in ANGLE in Google Chrome prior to 91.0.4472.101 allowed a remote attacker to potentially perform out of bounds memory access via a crafted HTML page.
32 CVE-2021-29991 444 2021-11-03 2021-11-04
5.8
None Remote Medium Not required Partial Partial None
Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers. This allowed for a header splitting attack against servers using HTTP/3. This vulnerability affects Firefox < 91.0.1 and Thunderbird < 91.0.1.
33 CVE-2021-29990 787 Mem. Corr. 2021-08-17 2022-05-03
6.8
None Remote Medium Not required Partial Partial Partial
Mozilla developers and community members reported memory safety bugs present in Firefox 90. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 91.
34 CVE-2021-29989 787 Mem. Corr. 2021-08-17 2022-05-03
6.8
None Remote Medium Not required Partial Partial Partial
Mozilla developers reported memory safety bugs present in Firefox 90 and Firefox ESR 78.12. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.13, Firefox ESR < 78.13, and Firefox < 91.
35 CVE-2021-29988 125 Mem. Corr. 2021-08-17 2022-04-25
6.8
None Remote Medium Not required Partial Partial Partial
Firefox incorrectly treated an inline list-item element as a block element, resulting in an out of bounds read or memory corruption, and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
36 CVE-2021-29985 416 Mem. Corr. 2021-08-17 2022-03-16
6.8
None Remote Medium Not required Partial Partial Partial
A use-after-free vulnerability in media channels could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
37 CVE-2021-29984 787 Mem. Corr. 2021-08-17 2022-05-03
6.8
None Remote Medium Not required Partial Partial Partial
Instruction reordering resulted in a sequence of instructions that would cause an object to be incorrectly considered during garbage collection. This led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
38 CVE-2021-29982 772 2021-08-17 2022-03-16
4.3
None Remote Medium Not required Partial None None
Due to incorrect JIT optimization, we incorrectly interpreted data from the wrong type of object, resulting in the potential leak of a single bit of memory. This vulnerability affects Firefox < 91 and Thunderbird < 91.
39 CVE-2021-29981 2021-08-17 2022-03-16
6.8
None Remote Medium Not required Partial Partial Partial
An issue present in lowering/register allocation could have led to obscure but deterministic register confusion failures in JITted code that would lead to a potentially exploitable crash. This vulnerability affects Firefox < 91 and Thunderbird < 91.
40 CVE-2021-29980 909 Mem. Corr. 2021-08-17 2022-03-16
6.8
None Remote Medium Not required Partial Partial Partial
Uninitialized memory in a canvas object could have caused an incorrect free() leading to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
41 CVE-2021-29977 787 Mem. Corr. 2021-08-05 2022-03-16
6.8
None Remote Medium Not required Partial Partial Partial
Mozilla developers reported memory safety bugs present in Firefox 89. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 90.
42 CVE-2021-29976 787 Mem. Corr. 2021-08-05 2022-03-16
6.8
None Remote Medium Not required Partial Partial Partial
Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90.
43 CVE-2021-29975 2021-08-05 2022-03-16
4.3
None Remote Medium Not required None Partial None
Through a series of DOM manipulations, a message, over which the attacker had control of the text but not HTML or formatting, could be overlaid on top of another domain (with the new domain correctly shown in the address bar) resulting in possible user confusion. This vulnerability affects Firefox < 90.
44 CVE-2021-29974 2021-08-05 2022-03-16
2.6
None Remote High Not required None Partial None
When network partitioning was enabled, e.g. as a result of Enhanced Tracking Protection settings, a TLS error page would allow the user to override an error on a domain which had specified HTTP Strict Transport Security (which implies that the error should not be override-able.) This issue did not affect the network connections, and they were correctly upgraded to HTTPS automatically. This vulnerability affects Firefox < 90.
45 CVE-2021-29972 416 2021-08-05 2022-03-25
6.8
None Remote Medium Not required Partial Partial Partial
A use-after-free vulnerability was found via testing, and traced to an out-of-date Cairo library. Updating the library resolved the issue, and may have remediated other, unknown security vulnerabilities as well. This vulnerability affects Firefox < 90.
46 CVE-2021-29970 787 Mem. Corr. 2021-08-05 2022-04-25
5.1
None Remote High Not required Partial Partial Partial
A malicious webpage could have triggered a use-after-free, memory corruption, and a potentially exploitable crash. *This bug could only be triggered when accessibility was enabled.*. This vulnerability affects Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90.
47 CVE-2021-29967 787 Mem. Corr. 2021-06-24 2022-05-03
6.8
None Remote Medium Not required Partial Partial Partial
Mozilla developers reported memory safety bugs present in Firefox 88 and Firefox ESR 78.11. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.11, Firefox < 89, and Firefox ESR < 78.11.
48 CVE-2021-29966 787 Mem. Corr. 2021-06-24 2022-05-03
6.8
None Remote Medium Not required Partial Partial Partial
Mozilla developers reported memory safety bugs present in Firefox 88. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 89.
49 CVE-2021-29961 863 2021-06-24 2021-09-20
4.3
None Remote Medium Not required None Partial None
When styling and rendering an oversized `<select>` element, Firefox did not apply correct clipping which allowed an attacker to paint over the user interface. This vulnerability affects Firefox < 89.
50 CVE-2021-29960 669 2021-06-24 2021-09-20
4.3
None Remote Medium Not required Partial None None
Firefox used to cache the last filename used for printing a file. When generating a filename for printing, Firefox usually suggests the web page title. The caching and suggestion techniques combined may have lead to the title of a website visited during private browsing mode being stored on disk. This vulnerability affects Firefox < 89.
Total number of vulnerabilities : 1564   Page : 1 (This Page)2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
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