CVE-2025-3034 — Out-of-bounds Write in Mozilla Firefox

CWE-787 — Out-of-bounds Write8 documents7 sources
Severity
8.1HIGHNVD
EPSS
0.3%
top 44.70%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedApr 1
Latest updateFeb 2

Description

Memory safety bugs present in Firefox 136 and Thunderbird 136. 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 137 and Thunderbird 137.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 2.2 | Impact: 5.9

Affected Packages3 packages

▶NVDmozilla/firefox< 137.0
▶NVDmozilla/thunderbird< 137.0
▶Ubuntumozilla/thunderbird< 1:140.7.1+build1-0ubuntu0.22.04.1

🔴Vulnerability Details

3
OSV
CVE-2025-3034: Memory safety bugs present in Firefox 136 and Thunderbird 136↗2025-04-01
▶
CVEList
Memory safety bugs fixed in Firefox 137 and Thunderbird 137↗2025-04-01
▶
GHSA
GHSA-2f7m-9j2c-gwvw: Memory safety bugs present in Firefox 136 and Thunderbird 136↗2025-04-01
▶

📋Vendor Advisories

4
Ubuntu
Thunderbird vulnerabilities↗2026-02-02
▶
Debian
CVE-2025-3034: firefox - Memory safety bugs present in Firefox 136 and Thunderbird 136. Some of these bug...↗2025
▶
Mozilla
Mozilla Foundation Security Advisory 2025-20: CVE-2025-3034↗
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Mozilla
Mozilla Foundation Security Advisory 2025-23: CVE-2025-3034↗
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CVE-2025-3034 — Out-of-bounds Write in Mozilla Firefox | cvebase