How severe is CVE-1999-1481?

CVE-1999-1481 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-1999-1481 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1481?

CVE-1999-1481 primarily affects National Science Foundation Squid Web Proxy. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-1481?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-1999-1481 published?

CVE-1999-1481 was published on 1999-12-31 and last updated on 2026-06-16.

CVE-1999-1481

CVE-1999-1481 is a medium-severity vulnerability in National Science Foundation Squid Web Proxy with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: National Science Foundation Squid Web Proxy
Published: 1999-12-31
Last modified: 2026-06-16

Description

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

Frequently asked questions

What is CVE-1999-1481?: Squid 2.2.STABLE5 and below, when using external authentication, allows attackers to bypass access controls via a newline in the user/password pair.
How severe is CVE-1999-1481?: CVE-1999-1481 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-1999-1481 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1481?: CVE-1999-1481 primarily affects National Science Foundation Squid Web Proxy. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-1481?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-1481 published?: CVE-1999-1481 was published on 1999-12-31 and last updated on 2026-06-16.

References

Affected products (5)

cpe:2.3:a:national_science_foundation:squid_web_proxy:1.0:*:*:*:*:*:*:*
cpe:2.3:a:national_science_foundation:squid_web_proxy:1.0novm:*:*:*:*:*:*:*
cpe:2.3:a:national_science_foundation:squid_web_proxy:1.1:*:*:*:*:*:*:*
cpe:2.3:a:national_science_foundation:squid_web_proxy:2.1:*:*:*:*:*:*:*
cpe:2.3:a:national_science_foundation:squid_web_proxy:2.2:*:*:*:*:*:*:*

More vulnerabilities in National Science Foundation Squid Web Proxy

CVE-1999-1273 — High (CVSS 7.5): Squid Internet Object Cache 1.1.20 allows users to bypass access control lists (ACLs) by encoding the URL with…
CVE-2001-0142 — Low (CVSS 1.2): squid 2.3 and earlier allows local users to overwrite arbitrary files via a symlink attack in some configurations.

All CVEs affecting National Science Foundation Squid Web Proxy →