CVE-2025-13012Network attack vector

Memory corruption via unsynchronized Graphics error logging

Published Nov 11, 2025 · Updated Apr 13, 2026

A Graphics race condition in Mozilla Firefox before 145 and Thunderbird before 145 allows remote attackers to corrupt memory via crafted web content. CrashStatsLogForwarder::UpdateStringsVector accesses a shared mStrings slot without acquiring mMutex while the render thread iterates that slot, freeing a buffer that remains in use. Exposure requires a user to load attacker-controlled content; the resulting use-after-free or double-free can crash the application and corrupt process memory.

CVSS severity7.5
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A Graphics race condition in Mozilla Firefox before 145 and Thunderbird before 145 allows remote attackers to corrupt memory via crafted web content. CrashStatsLogForwarder::UpdateStringsVector accesses a shared mStrings slot without acquiring mMutex while the render thread iterates that slot, freeing a buffer that remains in use. Exposure requires a user to load attacker-controlled content; the resulting use-after-free or double-free can crash the application and corrupt process memory.

The record

CVE
CVE-2025-13012
Published
Nov 11, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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