THREATPORT/VULNERABILITY/CVE-2004-0189
HIGH SEVERITY

CVE-2004-0189

Squid vulnerability

CVSS
7.5
EPSS
13.8%
EPSS pct
96th
Exploited
No known
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.
Affected vendor
Squid
Affected product
Squid
CVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
Published
2004-03-15

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to confidentiality, partial impact to integrity, partial impact to availability.

Its EPSS score of 13.8% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2004-0189

  • Confirm whether Squid Squid is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2004-0189.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2004-0189

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2004-0189 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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Are you exposed to CVE-2004-0189?

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