CVE-1999-1481

mediumpriority · track · 31EPSS 0.036 · 89 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · functional

Likely / severe?

3.57% (89th) EPSS

CVSS 5 · medium

Is it mine?

6 products

Who says so?

2 sources

enisa_euvd · nvd

EPSS · scored 2026-10-28

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

Technical severity, 0–10. One row per scoring source.

5.0

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v2.04.5mediumAV:N/AC:L/Au:N/C:P/I:N/A:N/E:POCsecondary · CVSS-BT (t0sche)

The CWE weakness classes this flaw belongs to.

CWE-20USLLM-inferred

Public proof-of-concept and weaponised exploit code.

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
national science foundation squid web proxy= 1.0nvdUScpe:2.3:a:national_science_foundation:squid_web_proxy:*:*:*:*:*:*:*:*
national science foundation squid web proxy= 1.0novmnvdUScpe:2.3:a:national_science_foundation:squid_web_proxy:*:*:*:*:*:*:*:*
national science foundation squid web proxy= 1.1nvdUScpe:2.3:a:national_science_foundation:squid_web_proxy:*:*:*:*:*:*:*:*
national science foundation squid web proxy= 2.1nvdUScpe:2.3:a:national_science_foundation:squid_web_proxy:*:*:*:*:*:*:*:*
national science foundation squid web proxy= 2.2nvdUScpe:2.3:a:national_science_foundation:squid_web_proxy:*:*:*:*:*:*:*:*

Other names and identifiers for this entity.

Which sources assert this record, and when.

published 1999-12-31modified 2026-06-16

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.