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Fencer Vulns
medium 5.0

CVE-2009-0478 json

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…

published 2009-02-08 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-0482

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
72.0%
EPSS 72.0% chance of exploitation in 30 days, percentile 99.4%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • squid Debian 14, Debian 13, Debian 12 2.7.STABLE3-4.1

debian advisories DEBIAN-CVE-2009-0478

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-0478 updated

Squid denial of service flaw

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. First public exploit (EDB-8021)

Exploit prediction

71.99% chance of exploitation in the next 30 days, higher than 99.4% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-8021 Squid < 3.1 5 - HTTP Version Number Parsing Denial of Service dos, 2009-02-09
  • securityfocus.com http://www.securityfocus.com/bid/33604 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.