Memory corruption via cancelled module load request
Published Jun 2, 2023 · Updated Jan 9, 2025
Use-after-free in Mozilla Firefox before 110, Firefox ESR before 102.8, and Thunderbird before 102.8 allows remote attackers to corrupt memory. ScriptLoadContext fails to check whether an unsuccessful module load request was already cancelled before releasing associated state, leaving its destructor to access freed heap memory. Exploitation requires interaction with attacker-controlled script-capable content; ordinary Thunderbird email reading does not expose this path.
Summary
What happened
Use-after-free in Mozilla Firefox before 110, Firefox ESR before 102.8, and Thunderbird before 102.8 allows remote attackers to corrupt memory. ScriptLoadContext fails to check whether an unsuccessful module load request was already cancelled before releasing associated state, leaving its destructor to access freed heap memory. Exploitation requires interaction with attacker-controlled script-capable content; ordinary Thunderbird email reading does not expose this path.
The record
- CVE
- CVE-2023-25739
- Published
- Jun 2, 2023
- Updated
- Jan 9, 2025
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- CWE-416, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 2, 2023CVE publishedPublication date reported by the CVE source.
- Jan 9, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <110
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Public exploit references
- Mozilla Bugzilla ScriptLoadContext testcaseproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo