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7.8

socks5 allows remote crash or code execution via long hostname

CVE-2002-2367 · published 23 years ago
Summary

The socks5 version 1.0 r11 and earlier can be tricked into overflowing its memory when a very long host name is sent. This can make the service stop working or, in some cases, let an attacker run their own code on the server. Update to a newer version of socks5 or apply the vendor's patch, and ensure host name lengths are validated.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
socks5 socks5 1.0_r11
cpe:2.3:a:socks5:socks5:1.0_r11:*:*:*:*:*:*:*
Original advisory text
Off-by-one buffer overflow in NEC SOCKS5 1.0 r11 and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary code via a long hostname.
Off-by-one buffer overflow in NEC SOCKS5 1.0 r11 and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary code via a long hostname.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker partial control (estimated)
Severity
7.8 High
Exploitation
5% chance of attack within 30 days
Type
CWE-119Buffer Overflow
CWE-189Numeric Errors
Timeline
Published31 Dec 2002
Updated22 Oct 2026
First seen29 Sep 2026
Sources
CVE-2002-2367 · NVD
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