Out-of-bounds write via encoded-string length overflow
Published Mar 19, 2024 · Updated Mar 13, 2025
Memory corruption in Mozilla Firefox before 124, Firefox ESR before 115.9, and Thunderbird before 115.9 allows attackers to write out of bounds. DOM serializer functions add untrusted string and escape-sequence lengths with unchecked 32-bit arithmetic, so StringBuilder::ToString allocates a buffer far smaller than the encoded output. Triggering requires combined expanded lengths of at least 0x100000000; ordinary Thunderbird mail reading disables scripting.
Summary
What happened
Memory corruption in Mozilla Firefox before 124, Firefox ESR before 115.9, and Thunderbird before 115.9 allows attackers to write out of bounds. DOM serializer functions add untrusted string and escape-sequence lengths with unchecked 32-bit arithmetic, so StringBuilder::ToString allocates a buffer far smaller than the encoded output. Triggering requires combined expanded lengths of at least 0x100000000; ordinary Thunderbird mail reading disables scripting.
The record
- CVE
- CVE-2024-2608
- Published
- Mar 19, 2024
- Updated
- Mar 13, 2025
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- CWE-680, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 19, 2024CVE publishedPublication date reported by the CVE source.
- Mar 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=0 <124
- Affected versionversion=unspecified <124
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
Public exploit references
- Mozilla Bug 1880692 HTML and worker proof of conceptproof of concept · demonstrated
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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