Is CVE-2004-0189 in the CISA KEV catalog?

No. CVE-2004-0189 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2004-0189?

CVE-2004-0189 has a CVSS v2 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2004-0189?

CVE-2004-0189 has an EPSS score of 13.81% (96th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2004-0189

HIGHEPSS 96th pctl

7.5

CVSS v2

NVD

Description

The "%xx" URL decoding function in Squid 2.5STABLE4 and earlier allows remote attackers to bypass url_regex ACLs via a URL with a NULL ("%00") character, which causes Squid to use only a portion of the requested URL when comparing it against the access control lists.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

13.81%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000838
http://marc.info/?l=bugtraq&m=108084935904110&w=2
http://security.gentoo.org/glsa/glsa-200403-11.xml
http://www.debian.org/security/2004/dsa-474
http://www.mandrakesoft.com/security/advisories?name=MDKSA-2004:025
http://www.osvdb.org/5916
http://www.redhat.com/support/errata/RHSA-2004-133.html
http://www.redhat.com/support/errata/RHSA-2004-134.html
http://www.securityfocus.com/bid/9778
http://www.squid-cache.org/Advisories/SQUID-2004_1.txt
https://exchange.xforce.ibmcloud.com/vulnerabilities/15366
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A877
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A941

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-16.