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The Common Vulnerabilities and Exposures (CVE) project, maintained by the MITRE Corporation, is a list of all standardized names for vulnerabilities and security exposures.

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IDDescriptionPriorityModified dateFixed Release
CVE-2021-23993 An attacker may perform a DoS attack to prevent a user from sending encrypted email to a correspondent. If an attacker creates a crafted OpenPGP key with a subkey that has an invalid self signature, and the Thunderbird user imports the crafted key, then Thunderbird may try to use the invalid subkey, but the RNP library rejects it from being used, causing encryption to fail. This vulnerability affects Thunderbird < 78.9.1. MEDIUM Jun 24, 2021 n/a
CVE-2021-23992 Thunderbird did not check if the user ID associated with an OpenPGP key has a valid self signature. An attacker may create a crafted version of an OpenPGP key, by either replacing the original user ID, or by adding another user ID. If Thunderbird imports and accepts the crafted key, the Thunderbird user may falsely conclude that the false user ID belongs to the correspondent. This vulnerability affects Thunderbird < 78.9.1. MEDIUM Jun 24, 2021 n/a
CVE-2021-23991 If a Thunderbird user has previously imported Alice\'s OpenPGP key, and Alice has extended the validity period of her key, but Alice\'s updated key has not yet been imported, an attacker may send an email containing a crafted version of Alice\'s key with an invalid subkey, Thunderbird might subsequently attempt to use the invalid subkey, and will fail to send encrypted email to Alice. This vulnerability affects Thunderbird < 78.9.1. MEDIUM Jun 24, 2021 n/a
CVE-2021-23988 Mozilla developers reported memory safety bugs present in Firefox 86. 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 < 87. MEDIUM Apr 5, 2021 n/a
CVE-2021-23987 Mozilla developers and community members reported memory safety bugs present in Firefox 86 and Firefox ESR 78.8. 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 < 78.9, Firefox < 87, and Thunderbird < 78.9. MEDIUM Apr 5, 2021 n/a
CVE-2021-23986 A malicious extension with the \'search\' permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions. This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication. This vulnerability affects Firefox < 87. MEDIUM Apr 5, 2021 n/a
CVE-2021-23985 If an attacker is able to alter specific about:config values (for example malware running on the user\'s computer), the Devtools remote debugging feature could have been enabled in a way that was unnoticable to the user. This would have allowed a remote attacker (able to make a direct network connection to the victim) to monitor the user\'s browsing activity and (plaintext) network traffic. This was addressed by providing a visual cue when Devtools has an open network socket. This vulnerability affects Firefox < 87. MEDIUM Apr 5, 2021 n/a
CVE-2021-23984 A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9. MEDIUM Apr 5, 2021 n/a
CVE-2021-23983 By causing a transition on a parent node by removing a CSS rule, an invalid property for a marker could have been applied, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 87. MEDIUM Apr 5, 2021 n/a
CVE-2021-23982 Using techniques that built on the slipstream research, a malicious webpage could have scanned both an internal network\'s hosts as well as services running on the user\'s local machine utilizing WebRTC connections. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9. MEDIUM Apr 5, 2021 n/a
CVE-2021-23981 A texture upload of a Pixel Buffer Object could have confused the WebGL code to skip binding the buffer used to unpack it, resulting in memory corruption and a potentially exploitable information leak or crash. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9. MEDIUM Apr 5, 2021 n/a
CVE-2021-23980 A mutation XSS affects users calling bleach.clean with all of: svg or math in the allowed tags p or br in allowed tags style, title, noscript, script, textarea, noframes, iframe, or xmp in allowed tags the keyword argument strip_comments=False Note: none of the above tags are in the default allowed tags and strip_comments defaults to True. -- Feb 17, 2023 n/a
CVE-2021-23979 Mozilla developers reported memory safety bugs present in Firefox 85. 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 < 86. MEDIUM Feb 26, 2021 n/a
CVE-2021-23978 Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. 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 < 86, Thunderbird < 78.8, and Firefox ESR < 78.8. MEDIUM Feb 26, 2021 n/a
CVE-2021-23977 Firefox for Android suffered from a time-of-check-time-of-use vulnerability that allowed a malicious application to read sensitive data from application directories. Note: This issue is only affected Firefox for Android. Other operating systems are unaffected. This vulnerability affects Firefox < 86. LOW Feb 26, 2021 n/a
CVE-2021-23976 When accepting a malicious intent from other installed apps, Firefox for Android accepted manifests from arbitrary file paths and allowed declaring webapp manifests for other origins. This could be used to gain fullscreen access for UI spoofing and could also lead to cross-origin attacks on targeted websites. Note: This issue is a different issue from CVE-2020-26954 and only affected Firefox for Android. Other operating systems are unaffected. This vulnerability affects Firefox < 86. MEDIUM Feb 26, 2021 n/a
CVE-2021-23975 The developer page about:memory has a Measure function for exploring what object types the browser has allocated and their sizes. When this function was invoked we incorrectly called the sizeof function, instead of using the API method that checks for invalid pointers. This vulnerability affects Firefox < 86. MEDIUM Feb 26, 2021 n/a
CVE-2021-23974 The DOMParser API did not properly process \'<noscript>\' elements for escaping. This could be used as an mXSS vector to bypass an HTML Sanitizer. This vulnerability affects Firefox < 86. MEDIUM Feb 26, 2021 n/a
CVE-2021-23973 When trying to load a cross-origin resource in an audio/video context a decoding error may have resulted, and the content of that error may have revealed information about the resource. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8. MEDIUM Feb 26, 2021 n/a
CVE-2021-23972 One phishing tactic on the web is to provide a link with HTTP Auth. For example \'https://www.phishingtarget.com@evil.com\'. To mitigate this type of attack, Firefox will display a warning dialog; however, this warning dialog would not have been displayed if evil.com used a redirect that was cached by the browser. This vulnerability affects Firefox < 86. MEDIUM Feb 26, 2021 n/a
CVE-2021-23971 When processing a redirect with a conflicting Referrer-Policy, Firefox would have adopted the redirect\'s Referrer-Policy. This would have potentially resulted in more information than intended by the original origin being provided to the destination of the redirect. This vulnerability affects Firefox < 86. MEDIUM Feb 26, 2021 n/a
CVE-2021-23970 Context-specific code was included in a shared jump table; resulting in assertions being triggered in multithreaded wasm code. This vulnerability affects Firefox < 86. MEDIUM Feb 26, 2021 n/a
CVE-2021-23969 As specified in the W3C Content Security Policy draft, when creating a violation report, User agents need to ensure that the source file is the URL requested by the page, pre-redirects. If that’s not possible, user agents need to strip the URL down to an origin to avoid unintentional leakage. Under certain types of redirects, Firefox incorrectly set the source file to be the destination of the redirects. This was fixed to be the redirect destination\'s origin. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8. MEDIUM Feb 26, 2021 n/a
CVE-2021-23968 If Content Security Policy blocked frame navigation, the full destination of a redirect served in the frame was reported in the violation report; as opposed to the original frame URI. This could be used to leak sensitive information contained in such URIs. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8. MEDIUM Feb 26, 2021 n/a
CVE-2021-23965 Mozilla developers reported memory safety bugs present in Firefox 84. 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 < 85. MEDIUM Feb 26, 2021 n/a
CVE-2021-23964 Mozilla developers reported memory safety bugs present in Firefox 84 and Firefox ESR 78.6. 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 < 85, Thunderbird < 78.7, and Firefox ESR < 78.7. MEDIUM Feb 26, 2021 n/a
CVE-2021-23963 When sharing geolocation during an active WebRTC share, Firefox could have reset the webRTC sharing state in the user interface, leading to loss of control over the currently granted permission. This vulnerability affects Firefox < 85. MEDIUM Feb 26, 2021 n/a
CVE-2021-23962 Incorrect use of the \'<RowCountChanged>\' method could have led to a user-after-poison and a potentially exploitable crash. This vulnerability affects Firefox < 85. MEDIUM Feb 26, 2021 n/a
CVE-2021-23961 Further techniques that built on the slipstream research combined with a malicious webpage could have exposed both an internal network\'s hosts as well as services running on the user\'s local machine. This vulnerability affects Firefox < 85. MEDIUM Feb 26, 2021 n/a
CVE-2021-23960 Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7. MEDIUM Feb 26, 2021 n/a
CVE-2021-23959 An XSS bug in internal error pages could have led to various spoofing attacks, including other error pages and the address bar. Note: This issue only affected Firefox for Android. Other operating systems are unaffected. This vulnerability affects Firefox < 85. MEDIUM Feb 26, 2021 n/a
CVE-2021-23958 The browser could have been confused into transferring a screen sharing state into another tab, which would leak unintended information. This vulnerability affects Firefox < 85. MEDIUM Feb 26, 2021 n/a
CVE-2021-23957 Navigations through the Android-specific `intent` URL scheme could have been misused to escape iframe sandbox. Note: This issue only affected Firefox for Android. Other operating systems are unaffected. This vulnerability affects Firefox < 85. MEDIUM Feb 26, 2021 n/a
CVE-2021-23956 An ambiguous file picker design could have confused users who intended to select and upload a single file into uploading a whole directory. This was addressed by adding a new prompt. This vulnerability affects Firefox < 85. MEDIUM Feb 26, 2021 n/a
CVE-2021-23955 The browser could have been confused into transferring a pointer lock state into another tab, which could have lead to clickjacking attacks. This vulnerability affects Firefox < 85. MEDIUM Feb 26, 2021 n/a
CVE-2021-23954 Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7. MEDIUM Feb 26, 2021 n/a
CVE-2021-23953 If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-origin information, when said information is served as chunked data. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7. MEDIUM Feb 26, 2021 n/a
CVE-2021-23952 Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was in a CNA pool that was not assigned to any issues. Notes: none. -- Nov 7, 2023 n/a
CVE-2021-23951 Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was in a CNA pool that was not assigned to any issues. Notes: none. -- Nov 7, 2023 n/a
CVE-2021-23950 Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was in a CNA pool that was not assigned to any issues. Notes: none. -- Nov 7, 2023 n/a
CVE-2021-23949 Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was in a CNA pool that was not assigned to any issues. Notes: none. -- Nov 7, 2023 n/a
CVE-2021-23948 Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was in a CNA pool that was not assigned to any issues. Notes: none. -- Nov 7, 2023 n/a
CVE-2021-23947 Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was in a CNA pool that was not assigned to any issues. Notes: none. -- Nov 7, 2023 n/a
CVE-2021-23946 Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was in a CNA pool that was not assigned to any issues. Notes: none. -- Nov 7, 2023 n/a
CVE-2021-23945 Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was in a CNA pool that was not assigned to any issues. Notes: none. -- Nov 7, 2023 n/a
CVE-2021-23944 Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was in a CNA pool that was not assigned to any issues. Notes: none. -- Nov 7, 2023 n/a
CVE-2021-23943 Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was in a CNA pool that was not assigned to any issues. Notes: none. -- Nov 7, 2023 n/a
CVE-2021-23942 Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was in a CNA pool that was not assigned to any issues. Notes: none. -- Nov 7, 2023 n/a
CVE-2021-23941 Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was in a CNA pool that was not assigned to any issues. Notes: none. -- Nov 7, 2023 n/a
CVE-2021-23940 Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was in a CNA pool that was not assigned to any issues. Notes: none. -- Nov 7, 2023 n/a
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