CVE-1999-1481: National Science Foundation Squid Web Proxy

Medium severity, CVSS 5.0. EPSS: 3.6% chance of exploitation in the next 30 days.

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 products

• National Science Foundation Squid Web Proxy: version 1.0 only; version 1.0novm only; version 1.1 only; version 2.1 only; version 2.2 only

Published 1999-12-31. Last modified 2026-06-16.