Arbitrary code execution via memory corruption
Published Dec 8, 2021 · Updated Aug 4, 2024
Memory-safety flaws in Mozilla Firefox before 94, Firefox ESR before 91.3, and Thunderbird before 91.3 allow attackers to run arbitrary code. The public advisories disclose evidence of memory corruption but not the affected functions or the unsafe operations performed on attacker-controlled input. Exploitation requires user interaction with attacker-controlled web content; ordinary Thunderbird message reading disables scripting and limits exposure.
Summary
What happened
Memory-safety flaws in Mozilla Firefox before 94, Firefox ESR before 91.3, and Thunderbird before 91.3 allow attackers to run arbitrary code. The public advisories disclose evidence of memory corruption but not the affected functions or the unsafe operations performed on attacker-controlled input. Exploitation requires user interaction with attacker-controlled web content; ordinary Thunderbird message reading disables scripting and limits exposure.
The record
- CVE
- CVE-2021-43534
- Published
- Dec 8, 2021
- Updated
- Aug 4, 2024
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 8, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record 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 <94
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
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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