Unspecified shutdown impact via non-virtual base deletion
Published Dec 19, 2023 · Updated Feb 13, 2025
Undefined behavior in Mozilla Firefox before 121, Firefox ESR before 115.6, and Thunderbird before 115.6 allows unspecified impact. ShutdownObserver deletes cached nsString objects through nsAString base pointers whose static type lacks a virtual destructor, making each deletion undefined. The fault is reached while graphics-driver strings are cleared during application shutdown; Mozilla calls it a minor shutdown security issue but publishes no concrete consequence.
Summary
What happened
Undefined behavior in Mozilla Firefox before 121, Firefox ESR before 115.6, and Thunderbird before 115.6 allows unspecified impact. ShutdownObserver deletes cached nsString objects through nsAString base pointers whose static type lacks a virtual destructor, making each deletion undefined. The fault is reached while graphics-driver strings are cleared during application shutdown; Mozilla calls it a minor shutdown security issue but publishes no concrete consequence.
The record
- CVE
- CVE-2023-6863
- Published
- Dec 19, 2023
- Updated
- Feb 13, 2025
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- Unavailable
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 19, 2023CVE 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 <121
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.
Weakness, pattern, technique
No sourced classifications are available.
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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