CVE-2009-0478
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…
- 5.0MediumCVSS base score
- 72.0%Exploitation in 30 daysEPSS · top 0.6% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 1Public exploitsMetasploit, Nuclei and Exploit-DB
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list an Exploit-DB entry for it. A reference of the record is tagged as an exploit.
Show the exploits2
Exploit-DB1 entry
- Squid < 3.1 5 - HTTP Version Number Parsing Denial of Service (Exploit-DB entry) (opens in a new tab)
EDB-ID 8021dos, multiplepublished 9 Feb 2009Verified
References tagged exploit1 reference
- 8021 (opens in a new tab)exploitx_refsource_EXPLOIT-DBx_transferred
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By mitre
Published
- 16 years later
· 16 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
- EPSS (exploitation in 30 days)
- 72.0% · top 0.6% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.
Affected products
n/a
- affected n/a
References
12
- 33604 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- 33731 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- GLSA-200903-38 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- 20090204 Squid Proxy Cache Denial of Service in request handling (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- SUSE-SR:2009:005 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=484246 (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www.squid-cache.org/Versions/v2/2.7/changesets/12432.patch (opens in a new tab)x_refsource_CONFIRMx_transferred
- 1021684 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- http://www.squid-cache.org/Advisories/SQUID-2009_1.txt (opens in a new tab)x_refsource_CONFIRMx_transferred
- MDVSA-2009:034 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
- 8021 (opens in a new tab)exploitx_refsource_EXPLOIT-DBx_transferred
- 34467 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2009-0482 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2009-0478)Record last updated .