CVE-2025-1009 — Use After Free in Mozilla Firefox

CWE-416 — Use After Free14 documents8 sources
Severity
9.8CRITICALNVD
EPSS
0.8%
top 25.93%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla ThunderbirdMozilla Firefox
Timeline
PublishedFeb 4
Latest updateJul 22

Description

An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages4 packages

▶NVDmozilla/firefox128.1.0 — 128.7.0+2
▶Ubuntumozilla/firefox< 135.0+build2-0ubuntu0.20.04.1
▶NVDmozilla/thunderbird128.0.1 — 128.7.0+1
▶Debianmozilla/thunderbird< 1:128.7.0esr-1~deb11u1+3

🔴Vulnerability Details

4
OSV
firefox vulnerabilities↗2025-02-11
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GHSA
GHSA-v9m4-7h7v-vqrf: An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash↗2025-02-04
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OSV
CVE-2025-1009: An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash↗2025-02-04
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CVEList
Use-after-free in XSLT↗2025-02-04
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📋Vendor Advisories

9
Ubuntu
Thunderbird vulnerabilities↗2025-07-22
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Ubuntu
Firefox vulnerabilities↗2025-02-11
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Red Hat
firefox: thunderbird: Use-after-free in XSLT↗2025-02-04
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Debian
CVE-2025-1009: firefox - An attacker could have caused a use-after-free via crafted XSLT data, leading to...↗2025
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Mozilla
Mozilla Foundation Security Advisory 2025-09: CVE-2025-1009↗
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