CVE-2025-10527: mozilla firefox Use After Free
CVSS: 7.1v3.1HighModified
AliasesUBUNTU-CVE-2025-10527DEBIAN-CVE-2025-10527CGA-34mj-fq2q-mvm3CGA-jcxm-4c6q-vr8wCGA-846c-cg4p-9567CGA-qcf2-43xm-wrr4
Published 16-09-2025Last modified 13-04-2026
Vulnerability summary
CVE-2025-10527 is a high (CVSS 7.1) Use After Free vulnerability in mozilla firefox. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 18.8% of scored vulnerabilities.
CVSS score
7.1/10
010
High · v3.1 (CVE.org)EPSS score
0.28%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 35 · Related 10DLA-4305-1DLA-4311-1DSA-6003-1DSA-6011-1MGASA-2025-0246MGASA-2025-0247OPENSUSE-SU-2025:15555-1OPENSUSE-SU-2025:15560-1OPENSUSE-SU-2025:15565-1OPENSUSE-SU-2025:20021-1OPENSUSE-SU-2025:20065-1RHSA-2025:16108RHSA-2025:16109RHSA-2025:16156RHSA-2025:16157RHSA-2025:16260RHSA-2025:16589RHSA-2025:17340RHSA-2025:17341RHSA-2025:17342RHSA-2025:17343RHSA-2025:17344RHSA-2025:17345RHSA-2025:17346RHSA-2025:17367RHSA-2025:17368RHSA-2025:17371RHSA-2025:17372RHSA-2025:17373RHSA-2025:17374RHSA-2025:17378RHSA-2025:17453SUSE-SU-2025:03291-1SUSE-SU-2025:03309-1SUSE-SU-2025:21021-1CGA-R743-38R6-XCW7USN-7991-1
Timeline
- 16-09-2025PublishedVulnerability first disclosed.
- 13-04-2026Last modifiedVulnerability information updated.
Description
Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
CVSS metrics
6 scores · 6 sources · 1 versionHigh 7.1Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:LSourcesAll 6 agree
- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
- OSV · DebianEcosystem advisory · calculated7.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
- OSV · WolfiEcosystem advisory · calculated7.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
- OSV · ChainguardEcosystem advisory · calculated7.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
- NVDNIST7.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
EPSS trend
Probability
0.28%
Chance of exploitation in the next 30 days
Percentile
19%
Versus all other CVEs
30-day change
0.00 pp
From 0.28% on 19-09-2026
19-09-202619-10-2026
EPSS score0.28%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu8 products
- mozjs102All versions (No fix recorded)
- mozjs115All versions (No fix recorded)
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
Chainguard2 products
- firefox< 140.3-r0
- firefox-esr< 140.3-r0
Debian2 products
- firefox-esr< 140.3.0esr-1~deb12u1 | < 140.3.0esr-1~deb13u1 | < 140.3.0esr-1
- thunderbird< 1:140.3.0esr-1~deb12u1 | < 1:140.3.0esr-1~deb13u1 | < 1:140.3.0esr-1
Mozilla2 products
- firefox< 140.3.0 | ≤ 143.0
- thunderbird< 140.3.0 | ≥ 141.0, < 143.0
Wolfi1 product
- firefox< 140.3-r0
5 vendors · 15 products
