CVE-2025-0243Medium· 5.1▾ SunlitMemory 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 …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 28.1 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 30.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
Last analysed / modified upstream
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 Thunderbird 128.6.
firefox < 128.6.0firefox < 133.0thunderbird < 128.6.0thunderbird >= 129.0, < 134.0Upgrade past the affected range:
firefox 133.0thunderbird 134.0Connected by shared product, vendor, weakness, or advisory.
CVE-2025-0242Medium· 6.5Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5, Thunderbird 115.18, and Thunderbird 128.5
CVE-2025-0247Critical· 9.8Memory safety bugs present in Firefox 133 and Thunderbird 133
CVE-2025-0239Medium· 4.0When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site
CVE-2025-0240Medium· 4.0Parsing a JavaScript module as JSON could, under some circumstances, cause cross-compartment access, which may result in a use-after-free
CVE-2025-0241High· 7.7When segmenting specially crafted text, segmentation would corrupt memory leading to a potentially exploitable crash
CVE-2025-0237Medium· 5.4The WebChannel API, which is used to transport various information across processes, did not check the sending principal but rather accepted the principal being sent