CVE-1999-1481

Squid Web Proxy vulnerability

CVSS

5.0

EPSS

3.6%

EPSS pct

88th

Exploited

No known

Squid 2.2.STABLE5 and below, when using external authentication, allows attackers to bypass access controls via a newline in the user/password pair.

Affected vendor

National Science Foundation

Affected product

Squid Web Proxy

CVSS vector

AV:N/AC:L/Au:N/C:P/I:N/A:N

Published

1999-12-31

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.

Its EPSS score of 3.6% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-1999-1481

Confirm whether National Science Foundation Squid Web Proxy is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-1999-1481.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-1999-1481

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-1999-1481 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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