CVE-2025-0243

low-risk
Published 2025-01-07

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.

Do I need to act?

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0.03% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.1/10 Medium
LOCAL / LOW complexity

Affected Products (3)

Affected Vendors

Mozilla

References (6)

Broken Link https://bugzilla.mozilla.org/buglist.cgi?bug_id=1827142%2C1932783
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-01/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-02/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-04/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-05/
https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html
26
/ 100
low-risk
Severity 17/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 9/34 · Low