Memory corruption via ICU allocation-failure handling
Published Mar 19, 2024 · Updated Feb 13, 2025
Use-after-free in ICU in Mozilla Firefox ESR and Thunderbird before 115.9 allows attackers to corrupt memory via an out-of-memory condition. ICU can deallocate a shared UnicodeString array after allocation failure without propagating the failed state to every referencing instance, leading later release operations to access freed storage. Reaching the flaw requires an out-of-memory condition in ICU; affected processes can crash, and the stale shared state creates a use-after-free risk.
Summary
What happened
Use-after-free in ICU in Mozilla Firefox ESR and Thunderbird before 115.9 allows attackers to corrupt memory via an out-of-memory condition. ICU can deallocate a shared UnicodeString array after allocation failure without propagating the failed state to every referencing instance, leading later release operations to access freed storage. Reaching the flaw requires an out-of-memory condition in ICU; affected processes can crash, and the stale shared state creates a use-after-free risk.
The record
- CVE
- CVE-2024-2616
- Published
- Mar 19, 2024
- Updated
- Feb 13, 2025
- Vendor
- Mozilla
- Product
- Thunderbird
- Classifications
- CWE-787, T1499
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Mar 19, 2024CVE publishedPublication date reported by the CVE source.
- Feb 13, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <115.9
What conditions does exploitation require?
What is affected?
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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