CVE-2005-0173

squid_ldap_auth in Squid 2.5 and earlier allows remote authenticated users to bypass username-based Access Control Lists (ACLs) via a username with a space at the beginning or end, which is ignored by the LDAP server.

Published: 2005-05-02 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2005-0173 is rated Moderate Risk (58/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.69%). Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2005-0173

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 2025-03-30 1.93% 1.69% -0.24%
2 2025-03-29 1.69% 1.93% +0.24%
3 2025-03-17 — 1.69% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2005-0173

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/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:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2005-0173

OS Trackers for CVE-2005-0173

vendor priority summary link
debian not yet assigned CVE-2005-0173 not yet assigned 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-2005-0173
redhat — — https://access.redhat.com/security/cve/CVE-2005-0173
ubuntu medium CVE-2005-0173 medium priority: Ubuntu including 1 source packages (squid), 4 status rows across 4 suites (dapper, edgy, feisty, upstream): released 3, needs-triage 1. https://ubuntu.com/security/CVE-2005-0173

Affected software / configurations for CVE-2005-0173

Vendor Product Version Raw CPE
squid squid 2.0.patch1 cpe:2.3:a:squid:squid:2.0.patch1:*:*:*:*:*:*:*
squid squid 2.0.patch2 cpe:2.3:a:squid:squid:2.0.patch2:*:*:*:*:*:*:*
squid squid 2.0.pre1 cpe:2.3:a:squid:squid:2.0.pre1:*:*:*:*:*:*:*
squid squid 2.0.release cpe:2.3:a:squid:squid:2.0.release:*:*:*:*:*:*:*
squid squid 2.1.patch1 cpe:2.3:a:squid:squid:2.1.patch1:*:*:*:*:*:*:*
squid squid 2.1.patch2 cpe:2.3:a:squid:squid:2.1.patch2:*:*:*:*:*:*:*
squid squid 2.1.pre1 cpe:2.3:a:squid:squid:2.1.pre1:*:*:*:*:*:*:*
squid squid 2.1.pre3 cpe:2.3:a:squid:squid:2.1.pre3:*:*:*:*:*:*:*
squid squid 2.1.pre4 cpe:2.3:a:squid:squid:2.1.pre4:*:*:*:*:*:*:*
squid squid 2.1.release cpe:2.3:a:squid:squid:2.1.release:*:*:*:*:*:*:*
squid squid 2.2.devel3 cpe:2.3:a:squid:squid:2.2.devel3:*:*:*:*:*:*:*
squid squid 2.2.devel4 cpe:2.3:a:squid:squid:2.2.devel4:*:*:*:*:*:*:*
squid squid 2.2.pre1 cpe:2.3:a:squid:squid:2.2.pre1:*:*:*:*:*:*:*
squid squid 2.2.pre2 cpe:2.3:a:squid:squid:2.2.pre2:*:*:*:*:*:*:*
squid squid 2.2.stable1 cpe:2.3:a:squid:squid:2.2.stable1:*:*:*:*:*:*:*
squid squid 2.2.stable2 cpe:2.3:a:squid:squid:2.2.stable2:*:*:*:*:*:*:*
squid squid 2.2.stable3 cpe:2.3:a:squid:squid:2.2.stable3:*:*:*:*:*:*:*
squid squid 2.2.stable4 cpe:2.3:a:squid:squid:2.2.stable4:*:*:*:*:*:*:*
squid squid 2.2.stable5 cpe:2.3:a:squid:squid:2.2.stable5:*:*:*:*:*:*:*
squid squid 2.3.devel2 cpe:2.3:a:squid:squid:2.3.devel2:*:*:*:*:*:*:*
squid squid 2.3.devel3 cpe:2.3:a:squid:squid:2.3.devel3:*:*:*:*:*:*:*
squid squid 2.3.stable1 cpe:2.3:a:squid:squid:2.3.stable1:*:*:*:*:*:*:*
squid squid 2.3.stable2 cpe:2.3:a:squid:squid:2.3.stable2:*:*:*:*:*:*:*
squid squid 2.3.stable3 cpe:2.3:a:squid:squid:2.3.stable3:*:*:*:*:*:*:*
squid squid 2.3.stable4 cpe:2.3:a:squid:squid:2.3.stable4:*:*:*:*:*:*:*
squid squid 2.3.stable5 cpe:2.3:a:squid:squid:2.3.stable5:*:*:*:*:*:*:*
squid squid 2.4.stable1 cpe:2.3:a:squid:squid:2.4.stable1:*:*:*:*:*:*:*
squid squid 2.4.stable2 cpe:2.3:a:squid:squid:2.4.stable2:*:*:*:*:*:*:*
squid squid 2.4.stable3 cpe:2.3:a:squid:squid:2.4.stable3:*:*:*:*:*:*:*
squid squid 2.4.stable4 cpe:2.3:a:squid:squid:2.4.stable4:*:*:*:*:*:*:*
squid squid 2.4.stable6 cpe:2.3:a:squid:squid:2.4.stable6:*:*:*:*:*:*:*
squid squid 2.4.stable7 cpe:2.3:a:squid:squid:2.4.stable7:*:*:*:*:*:*:*
squid squid 2.5.stable1 cpe:2.3:a:squid:squid:2.5.stable1:*:*:*:*:*:*:*
squid squid 2.5.stable2 cpe:2.3:a:squid:squid:2.5.stable2:*:*:*:*:*:*:*
squid squid 2.5.stable3 cpe:2.3:a:squid:squid:2.5.stable3:*:*:*:*:*:*:*
squid squid 2.5.stable4 cpe:2.3:a:squid:squid:2.5.stable4:*:*:*:*:*:*:*
squid squid 2.5.stable5 cpe:2.3:a:squid:squid:2.5.stable5:*:*:*:*:*:*:*
squid squid 2.5.stable6 cpe:2.3:a:squid:squid:2.5.stable6:*:*:*:*:*:*:*

References for CVE-2005-0173

URL Tags
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000923 Patch
http://fedoranews.org/updates/FEDORA--.shtml
http://marc.info/?l=bugtraq&m=110780531820947&w=2
http://www.debian.org/security/2005/dsa-667 Patch Vendor Advisory
http://www.kb.cert.org/vuls/id/924198 Patch Third Party Advisory US Government Resource
http://www.mandriva.com/security/advisories?name=MDKSA-2005:034
http://www.novell.com/linux/security/advisories/2005_06_squid.html Patch Vendor Advisory
http://www.redhat.com/support/errata/RHSA-2005-060.html Patch Vendor Advisory
http://www.redhat.com/support/errata/RHSA-2005-061.html Patch Vendor Advisory
http://www.securityfocus.com/bid/12431
http://www.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE7-ldap_spaces Patch
http://www.squid-cache.org/Versions/v2/2.5/bugs/squid-2.5.STABLE7-ldap_spaces.patch Patch
http://www.squid-cache.org/bugs/show_bug.cgi?id=1187
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10251
cvelogic Threat Intelligence