CVE-2009-0478

Exp

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.

Published: 2009-02-08 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-0478 is rated High Exploit Risk (70.5/100): CVSS Medium severity, with high exploitation likelihood (EPSS 77.05%, 99th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2009-0478

EDB-ID Source Kind Published Link
8021 exploit_db edb 2009-02-09 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2009-0478

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-31 76.17% 77.05% +0.88%
2 2026-01-01 77.41% 76.17% -1.24%
3 2025-08-27 — 77.41% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-0478

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2009-0478

OS Trackers for CVE-2009-0478

vendor priority summary link
debian medium CVE-2009-0478 medium priority: Debian including 1 source packages (squid), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2009-0478
gentoo normal CVE-2009-0478: 1 GLSA(s) (200903-38), 1 atom(s) (net-proxy/squid); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2009-0478
redhat medium — https://access.redhat.com/security/cve/CVE-2009-0478
ubuntu medium CVE-2009-0478 medium priority: Ubuntu including 2 source packages (squid, squid3), 22 status rows across 11 suites (dapper, gutsy, hardy, intrepid, jaunty, karmic, lucid, maverick, natty, oneiric, upstream): not-affected 15, ignored 3, released 3, DNE 1. https://ubuntu.com/security/CVE-2009-0478

Vendor comments (NVD) for CVE-2009-0478

  • Red Hat (2009-02-09T00:00:00)

    Not vulnerable. This issue did not affect the version of Squid as shipped with Red Hat Enterprise Linux 2.1, 3, 4, or 5.

Affected software / configurations for CVE-2009-0478

Vendor Product Version Raw CPE
squid squid 2.7.stable1 cpe:2.3:a:squid:squid:2.7.stable1:*:*:*:*:*:*:*
squid squid 2.7.stable2 cpe:2.3:a:squid:squid:2.7.stable2:*:*:*:*:*:*:*
squid squid 2.7.stable3 cpe:2.3:a:squid:squid:2.7.stable3:*:*:*:*:*:*:*
squid squid 2.7.stable4 cpe:2.3:a:squid:squid:2.7.stable4:*:*:*:*:*:*:*
squid squid 2.7.stable5 cpe:2.3:a:squid:squid:2.7.stable5:*:*:*:*:*:*:*
squid squid 3.0.stable1 cpe:2.3:a:squid:squid:3.0.stable1:*:*:*:*:*:*:*
squid squid 3.0.stable2 cpe:2.3:a:squid:squid:3.0.stable2:*:*:*:*:*:*:*
squid squid 3.0.stable3 cpe:2.3:a:squid:squid:3.0.stable3:*:*:*:*:*:*:*
squid squid 3.0.stable4 cpe:2.3:a:squid:squid:3.0.stable4:*:*:*:*:*:*:*
squid squid 3.0.stable5 cpe:2.3:a:squid:squid:3.0.stable5:*:*:*:*:*:*:*
squid squid 3.0.stable6 cpe:2.3:a:squid:squid:3.0.stable6:*:*:*:*:*:*:*
squid squid 3.0.stable7 cpe:2.3:a:squid:squid:3.0.stable7:*:*:*:*:*:*:*
squid squid 3.0.stable8 cpe:2.3:a:squid:squid:3.0.stable8:*:*:*:*:*:*:*
squid squid 3.0.stable9 cpe:2.3:a:squid:squid:3.0.stable9:*:*:*:*:*:*:*
squid squid 3.0.stable10 cpe:2.3:a:squid:squid:3.0.stable10:*:*:*:*:*:*:*
squid squid 3.0.stable11 cpe:2.3:a:squid:squid:3.0.stable11:*:*:*:*:*:*:*
squid squid 3.0.stable12 cpe:2.3:a:squid:squid:3.0.stable12:*:*:*:*:*:*:*
squid squid 3.1 cpe:2.3:a:squid:squid:3.1:*:*:*:*:*:*:*
squid squid 3.1.0.1 cpe:2.3:a:squid:squid:3.1.0.1:*:*:*:*:*:*:*
squid squid 3.1.0.2 cpe:2.3:a:squid:squid:3.1.0.2:*:*:*:*:*:*:*
squid squid 3.1.0.3 cpe:2.3:a:squid:squid:3.1.0.3:*:*:*:*:*:*:*
squid squid 3.1.0.4 cpe:2.3:a:squid:squid:3.1.0.4:*:*:*:*:*:*:*

References for CVE-2009-0478

cvelogic Threat Intelligence