CVE-2025-0238 — Use After Free in Mozilla Firefox

CWE-416 — Use After Free14 documents8 sources
Severity
5.3MEDIUMNVD
OSV5.4
EPSS
0.1%
top 67.94%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla ThunderbirdMozilla Firefox
Timeline
PublishedJan 7
Latest updateJul 22

Description

Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Firefox ESR 115.19, Thunderbird 134, and Thunderbird 128.6.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NExploitability: 3.9 | Impact: 1.4

Affected Packages4 packages

▶NVDmozilla/firefox116.0 — 128.6.0+2
▶Ubuntumozilla/firefox< 134.0+build1-0ubuntu0.20.04.1
▶NVDmozilla/thunderbird129.0 — 134.0+1
▶Debianmozilla/thunderbird< 1:128.6.0esr-1~deb11u1+3

🔴Vulnerability Details

4
OSV
firefox vulnerabilities↗2025-01-09
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GHSA
GHSA-phcc-6pmp-qw9v: Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to a potentially exploitable crash↗2025-01-07
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CVEList
Use-after-free when breaking lines in text↗2025-01-07
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OSV
CVE-2025-0238: Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to a potentially exploitable crash↗2025-01-07
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📋Vendor Advisories

9
Ubuntu
Thunderbird vulnerabilities↗2025-07-22
▶
Ubuntu
Firefox vulnerabilities↗2025-01-09
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Red Hat
firefox: thunderbird: Use-after-free when breaking lines in text↗2025-01-07
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Debian
CVE-2025-0238: firefox - Assuming a controlled failed memory allocation, an attacker could have caused a ...↗2025
▶
Mozilla
Mozilla Foundation Security Advisory 2025-04: CVE-2025-0238↗
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CVE-2025-0238 — Use After Free in Mozilla Firefox | cvebase