Description
Squid 3.0 through 3.0.STABLE16 and 3.1 through 3.1.0.11 allows remote attackers to cause a denial of service via malformed requests including (1) "missing or mismatched protocol identifier," (2) missing or negative status value," (3) "missing version," or (4) "missing or invalid status number," related to (a) HttpMsg.cc and (b) HttpReply.cc.
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 5.0 | squid3 | 3.0.STABLE-3+lenny2 | DSA-1843-2, DSA-1843-1 |
Advisories 2
- DSA-1843-2 squid3 - regression fix Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1843-1 squid3 - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
References
- 1022607 vdb-entry
- http://www.squid-cache.org/Versions/v3/3.1/changesets/b9661.patch
- 35812 vdb-entry
- ADV-2009-2013 vdb-entry
- 36007 third-party-advisory
- http://www.squid-cache.org/Advisories/SQUID-2009_2.txt
- MDVSA-2009:161 vendor-advisory
- MDVSA-2009:178 vendor-advisory