CVE-1999-1481

NONECVSS 0.0Weaponized

0.0

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

CVSS v3: —
EG Score: —
EPSS: 90.6%
KEV: Not listed

Published

December 31, 1999

Last Modified

April 16, 2026

References (8)

cve@mitrehttp://www.securityfocus.com/archive/1/33295
cve@mitrehttp://www.securityfocus.com/bid/741
cve@mitrehttp://www.squid-cache.org/Versions/v2/2.2/bugs/
cve@mitrehttps://exchange.xforce.ibmcloud.com/vulnerabilities/3433
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/archive/1/33295
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/741
af854a3a-2127-422b-91ae-364da2661108http://www.squid-cache.org/Versions/v2/2.2/bugs/
af854a3a-2127-422b-91ae-364da2661108https://exchange.xforce.ibmcloud.com/vulnerabilities/3433

Data Freshness Timeline

(refreshed 13× in last 7d / 19× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-29 13:40 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
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2026-05-26 13:41 UTCepss_batch
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2026-05-26 07:16 UTCepss_batch
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2026-05-24 16:42 UTCepss_batch
2026-05-21 22:38 UTCepss_batch
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2026-05-18 21:29 UTCepss_batch
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-19567✓ verified
First seen Oct 25, 1999
National Science Foundation Squid Web Proxy 1.0/1.1/2.1 - Authentication Failure
Open source ↗

Frequently asked(4)

What is CVE-1999-1481?

CVE-1999-1481 is a none vulnerability published on December 31, 1999. Squid 2.2.STABLE5 and below, when using external authentication, allows attackers to bypass access controls via a newline in the user/password pair.

When was CVE-1999-1481 disclosed?

CVE-1999-1481 was first published in the National Vulnerability Database on December 31, 1999, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-1999-1481 actively exploited?

CVE-1999-1481 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-1999-1481?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-1481, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-1999-1481

📅 Published

🔄 Last Modified

🔗 References (8)