Out-of-bounds heap writes via buffer-size overflow
Published Feb 18, 2022 · Updated May 5, 2025
Integer overflow in Expat before 2.4.5 allows remote attackers to trigger out-of-bounds heap writes through crafted UTF-16 XML. storeRawNames adds a rounded raw-name length to a signed buffer size without first checking whether the sum exceeds INT_MAX, causing undersized buffer allocation. Exploitation requires gigabyte-scale input on a 64-bit, non-XML_UNICODE build; resulting memory corruption can crash the process or enable code execution.
Summary
What happened
Integer overflow in Expat before 2.4.5 allows remote attackers to trigger out-of-bounds heap writes through crafted UTF-16 XML. storeRawNames adds a rounded raw-name length to a signed buffer size without first checking whether the sum exceeds INT_MAX, causing undersized buffer allocation. Exploitation requires gigabyte-scale input on a 64-bit, non-XML_UNICODE build; resulting memory corruption can crash the process or enable code execution.
The record
- CVE
- CVE-2022-25315
- Published
- Feb 18, 2022
- Updated
- May 5, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 18, 2022CVE publishedPublication date reported by the CVE source.
- May 5, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
- Upstream storeRawNames AddressSanitizer proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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