Critical severity9.8NVD Advisory· Published Feb 4, 2025· Updated Apr 13, 2026
CVE-2025-1020
CVE-2025-1020
Description
Memory safety bugs present in Firefox 134 and Thunderbird 134. 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 135 and Thunderbird 135.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
7cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <135.0
- (no CPE)range: <= 134
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*range: >=131.0,<135.0
- (no CPE)range: <= 134
- osv-coords3 versionspkg:apk/chainguard/firefoxpkg:apk/wolfi/firefoxpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweed
< 135.0-r0+ 2 more
- (no CPE)range: < 135.0-r0
- (no CPE)range: < 135.0-r0
- (no CPE)range: < 135.0-1.1
Patches
Vulnerability mechanics
References
3- www.mozilla.org/security/advisories/mfsa2025-07/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2025-11/nvdVendor Advisory
- bugzilla.mozilla.org/buglist.cginvdBroken Link
News mentions
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