Description
The asn_parse_header function (asn1.c) in the SNMP module for Squid Web Proxy Cache before 2.4.STABLE7 allows remote attackers to cause a denial of service (server restart) via certain SNMP packets with negative length fields that trigger a memory allocation error.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | squid | 2.5.7 | — |
| Debian 13 | squid | 2.5.7 | — |
| Debian 12 | squid | 2.5.7 | — |
| Debian 3.0 | squid | 2.4.6-2woody4 | DSA-576-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 3 | squid | 7:2.5.STABLE3-6.3E.2 | RHSA-2004:591 |
Advisories 2
- RHSA-2004:591 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-576-1 squid - multiple Debian Security (DSA / DLA) · Mar 9, 2026
References
- CLA-2005:923 vendor-advisory
- 11385 vdb-entry
- RHSA-2004:591 vendor-advisory
- 20041011 Squid Web Proxy Cache Remote Denial of Service Vulnerability third-party-advisory
- http://www.squid-cache.org/Advisories/SQUID-2004_3.txt
- oval:org.mitre.oval:def:10931 vdb-entry signature
- ADV-2008-1969 vdb-entry
- 30967 third-party-advisory
- FLSA-2006:152809 vendor-advisory
- SUSE-SR:2008:014 vendor-advisory
- FEDORA-2008-6045 vendor-advisory
- OpenPKG-SA-2004.048 vendor-advisory
- squid-snmp-asnparseheader-dos(17688) vdb-entry
- 30914 third-party-advisory
- http://www.squid-cache.org/Advisories/SQUID-2008_1.txt
- GLSA-200410-15 vendor-advisory