Mozilla Firefox vulnerabilities

CVE-2025-1014 [HIGH] CWE-295 CVE-2025-1014: Certificate length was not properly checked when added to a certificate store. In practice only trus Certificate length was not properly checked when added to a certificate store. In practice only trusted data was processed. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

CVE-2025-1011 [HIGH] CWE-94 CVE-2025-1011: A bug in WebAssembly code generation could have lead to a crash. It may have been possible for an at A bug in WebAssembly code generation could have lead to a crash. It may have been possible for an attacker to leverage this to achieve code execution. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

CVE-2025-1012 [HIGH] CWE-416 CVE-2025-1012: A race during concurrent delazification could have led to a use-after-free. This vulnerability was f A race during concurrent delazification could have led to a use-after-free. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

CVE-2025-1010 [HIGH] CWE-416 CVE-2025-1010: An attacker could have caused a use-after-free via the Custom Highlight API, leading to a potentiall An attacker could have caused a use-after-free via the Custom Highlight API, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

CVE-2025-1013 [MEDIUM] CWE-362 CVE-2025-1013: A race condition could have led to private browsing tabs being opened in normal browsing windows. Th A race condition could have led to private browsing tabs being opened in normal browsing windows. This could have resulted in a potential privacy leak. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

CVE-2025-1018 [MEDIUM] CWE-1021 CVE-2025-1018: The fullscreen notification is prematurely hidden when fullscreen is re-requested quickly by the use The fullscreen notification is prematurely hidden when fullscreen is re-requested quickly by the user. This could have been leveraged to perform a potential spoofing attack. This vulnerability was fixed in Firefox 135 and Thunderbird 135.

CVE-2025-1019 [MEDIUM] CWE-1021 CVE-2025-1019: The z-order of the browser windows could be manipulated to hide the fullscreen notification. This co The z-order of the browser windows could be manipulated to hide the fullscreen notification. This could potentially be leveraged to perform a spoofing attack. This vulnerability was fixed in Firefox 135 and Thunderbird 135.

CVE-2025-23109 [MEDIUM] CWE-346 CVE-2025-23109: Long hostnames in URLs could be leveraged to obscure the actual host of the website or spoof the web Long hostnames in URLs could be leveraged to obscure the actual host of the website or spoof the website address. This vulnerability was fixed in Firefox for iOS 134.

CVE-2025-23108 [MEDIUM] CWE-79 CVE-2025-23108: Opening Javascript links in a new tab via long-press in the Firefox iOS client could result in a mal Opening Javascript links in a new tab via long-press in the Firefox iOS client could result in a malicious script spoofing the URL of the new tab. This vulnerability was fixed in Firefox for iOS 134.

CVE-2025-0247 [CRITICAL] CWE-787 CVE-2025-0247: Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bugs showed evidence of Memory safety bugs present in Firefox 133 and Thunderbird 133. 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 was fixed in Firefox 134 and Thunderbird 134.

CVE-2025-0241 [HIGH] CWE-401 CVE-2025-0241: When segmenting specially crafted text, segmentation would corrupt memory leading to a potentially e When segmenting specially crafted text, segmentation would corrupt memory leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.

CVE-2025-0240 [MEDIUM] CWE-416 CVE-2025-0240: Parsing a JavaScript module as JSON could, under some circumstances, cause cross-compartment access, Parsing a JavaScript module as JSON could, under some circumstances, cause cross-compartment access, which may result in a use-after-free. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.

CVE-2025-0239 [MEDIUM] CWE-295 CVE-2025-0239: When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirect When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.

CVE-2025-0238 [MEDIUM] CWE-416 CVE-2025-0238: Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, lead Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Firefox ESR 115.19, Thunderbird 134, and Thunderbird 128.6.

CVE-2025-0237 [MEDIUM] CWE-863 CVE-2025-0237: The WebChannel API, which is used to transport various information across processes, did not check t The WebChannel API, which is used to transport various information across processes, did not check the sending principal but rather accepted the principal being sent. This could have led to privilege escalation attacks. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.

CVE-2025-0242 [MEDIUM] CWE-787 CVE-2025-0242: Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5, T Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5, Thunderbird 115.18, and Thunderbird 128.5. 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 was fixed in Firefox 134, Firefox

CVE-2025-0244 [MEDIUM] CWE-601 CVE-2025-0244: When redirecting to an invalid protocol scheme, an attacker could spoof the address bar. *Note: Thi When redirecting to an invalid protocol scheme, an attacker could spoof the address bar. *Note: This issue only affected Android operating systems. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 134.

CVE-2025-0246 [MEDIUM] CVE-2025-0246: When using an invalid protocol scheme, an attacker could spoof the address bar. *Note: This issue o When using an invalid protocol scheme, an attacker could spoof the address bar. *Note: This issue only affected Android operating systems. Other operating systems are unaffected.* *Note: This issue is a different issue from CVE-2025-0244. This vulnerability was fixed in Firefox 134.

CVE-2025-0243 [MEDIUM] CWE-787 CVE-2025-0243: Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5 Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. 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 was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderb

CVE-2025-0245 [LOW] CVE-2025-0245: Under certain circumstances, a user opt-in setting that Focus should require authentication before u Under certain circumstances, a user opt-in setting that Focus should require authentication before use could have been be bypassed. This vulnerability was fixed in Firefox 134.