Client crash via unchecked server-message length
Published Jul 14, 2026 · Updated Jul 14, 2026
Heap buffer overflow in aMule 2.3.3 allows remote attackers to crash the client via a malformed OP_SERVERMESSAGE packet. CServerSocket::ProcessPacket subtracts two from an unchecked unsigned packet size, then passes the underflowed value to memcpy into a zero-length heap buffer. The client must connect to a malicious or compromised e2k server; a seven-byte packet after the login handshake reliably terminates the application.
Summary
What happened
Heap buffer overflow in aMule 2.3.3 allows remote attackers to crash the client via a malformed OP_SERVERMESSAGE packet. CServerSocket::ProcessPacket subtracts two from an unchecked unsigned packet size, then passes the underflowed value to memcpy into a zero-length heap buffer. The client must connect to a malicious or compromised e2k server; a seven-byte packet after the login handshake reliably terminates the application.
The record
- CVE
- CVE-2026-51105
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-121, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
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
- crash_poc.pyproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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