CVE-2010-0639 Null dereference in n/a
Remote attackers can crash the Squid proxy server by sending crafted packets to the HTCP port, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2010-0639?
CVE-2010-0639 is a medium-severity vulnerability in Squid-Cache Squid, published on 15 Feb 2010. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The htcpHandleTstRequest function in htcp.c in Squid 2.x before 2.6.STABLE24 and 2.7 before 2.7.STABLE8, and htcp.cc in 3.0 before 3.0.STABLE24, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via crafted packets to the HTCP port.
Which versions are affected by CVE-2010-0639?
It affects 1 product.
Products include Squid-Cache Squid.
How do I fix CVE-2010-0639?
Upgrade to a fixed version.
Is CVE-2010-0639 being exploited?
There is no known exploitation of CVE-2010-0639 in the wild and no public exploit code.
Other vulnerabilities in Squid-Cache Squid
- CVE-2025-62168 Squid vulnerable to information disclosure via authentication credential leakage in error handling
- CVE-2025-54574 Squid's URN Handling can lead to Buffer Overflow
- CVE-2026-33526 Squid vulnerable to Denial of Service in ICP Request handling
- CVE-2026-32748 Squid has Denial of Service in ICP Response handling
- CVE-2023-50269 SQUID-2023:10 Denial of Service in HTTP Request parsing
Sources
Also known as DEBIAN-CVE-2010-0639, GHSA-cg3x-2572-rpvr.