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CVE-2025-1009: firefox before 115.20.0 (exclusive), before 135.0 (exclusive), from 128.1.0 (inclusive), before 128.7.0 (exclusive); +1 more affected products
CVE-2025-1009. CVSS 3.1 base score 9.8 (CRITICAL, NVD). EPSS 0.01207 (percentile 0.67283), scored 2026-10-04.
Affected technology
firefox · before 115.20.0 (exclusive)
mozilla
firefox · before 135.0 (exclusive)
mozilla
firefox · from 128.1.0 (inclusive), before 128.7.0 (exclusive)
mozilla
thunderbird · from 128.0.1 (inclusive), before 128.7.0 (exclusive)
mozilla
thunderbird · from 131.0 (inclusive), before 135.0 (exclusive)
mozilla
Component: Not specified by the source
Attack conditions (NVD, CVSS 3.1): Network (remote) · No privileges required · No user interaction required
Attack conditions (Source advisory, CVSS 3.1): Network (remote) · No privileges required · No user interaction required
What an attacker can do
An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash. NVD’s CVSS 3.1 assessment (base score 9.8/10) rates confidentiality, integrity and availability impact as high. Source advisory’s CVSS 3.1 assessment (base score 9.8/10) rates confidentiality, integrity and availability impact as high.
- CWE
- CWE-416
- CCR priority
- 39.5 /100 (P4)
- CVSS 3.1
- 9.8 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · NVD
- EPSS
- 0.01207 · percentile 0.67283 · 2026-10-04
- KEV
- no
Provenance
- NVD CVE API 2.0 · Source record · observed 2026-10-05 23:09:08.830529+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2025-1009.html