CVE-2009-0478

Squid 2.7-2.7.STABLE5, 3.0-3.0.STABLE12, 3.1-3.1.0.4 - Denial of Service via Invalid HTTP Version Number

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2009-0478. PoCs published by Praveen Darshanam.

AI-analyzed exploit summary This exploit targets CVE-2009-0478, a DoS vulnerability in certain web servers by sending malformed HTTP version strings. It iterates through a list of malicious versions to trigger the vulnerability.

Description

Squid 2.7 to 2.7.STABLE5, 3.0 to 3.0.STABLE12, and 3.1 to 3.1.0.4 allows remote attackers to cause a denial of service via an HTTP request with an invalid version number, which triggers a reachable assertion in (1) HttpMsg.c and (2) HttpStatusLine.c.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Praveen Darshanam · perldosmultiple
https://www.exploit-db.com/exploits/8021

This exploit targets CVE-2009-0478, a DoS vulnerability in certain web servers by sending malformed HTTP version strings. It iterates through a list of malicious versions to trigger the vulnerability.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Web servers vulnerable to malformed HTTP version strings
No auth needed
Prerequisites: Network access to the target server · Target server running vulnerable software
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (12)

Core 12
Core References
Exploit, Patch vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/33604
Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/33731
Third Party Advisory vendor-advisory x_refsource_gentoo
http://security.gentoo.org/glsa/glsa-200903-38.xml
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/500653/100/0/threaded
Issue Tracking x_refsource_confirm
https://bugzilla.redhat.com/show_bug.cgi?id=484246
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id?1021684
Vendor Advisory x_refsource_confirm
http://www.squid-cache.org/Advisories/SQUID-2009_1.txt
Vendor Advisory vendor-advisory x_refsource_mandriva
http://www.mandriva.com/security/advisories?name=MDVSA-2009:034
Exploit, Third Party Advisory exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/8021
Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/34467

Scores

EPSS 0.7199
EPSS Percentile 99.4%

Details

CWE
CWE-20
Status published
Products (22)
squid/squid 2.7.stable1
squid/squid 2.7.stable2
squid/squid 2.7.stable3
squid/squid 2.7.stable4
squid/squid 2.7.stable5
squid/squid 3.0.stable1
squid/squid 3.0.stable2
squid/squid 3.0.stable3
squid/squid 3.0.stable4
squid/squid 3.0.stable5
... and 12 more
Published Feb 08, 2009
Tracked Since Feb 18, 2026