CVE-2025-0243: Memory Safety Bugs Present
Source GCVE Database
Not known to be exploited · CVSS 5.1 Medium · fixed in 134 : update affected systems when convenient.
Data as of 30 Oct 2026, 16:00 UTC
- Patch
- Available – fixed in 134, 128.6
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 7 Jan 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
AI-suggested
These vulnerabilities have been fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6. Users and administrators should update to these versions or later to remediate the issues. No additional mitigation actions are required beyond applying the official updates.
Description
Memory safety vulnerabilities were identified in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. These bugs showed evidence of memory corruption and could potentially be exploited to execute arbitrary code. The issues have been addressed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6. The vulnerabilities carry a medium severity rating with a CVSS score of 5.1.
References
- nvd.nist.gov/vuln/detail/CVE-2025-0243 (opens in a new tab)
- bugzilla.mozilla.org/buglist.cgi?bug_id=1827142%2C1932783 (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/01/msg00004.html (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-01 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-02 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-04 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-05 (opens in a new tab)