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VulnerabilityPublished Updated

CVE-2025-0243: Memory Safety Bugs Present

Source GCVE Database

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Authoritative record:CVE-2025-0243· Medium 5.1

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

CVSS 3.1 base score
5.1Medium
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 7 Jan 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

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