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TI-2020-09609 Aliases CVE-2020-11945GHSA-82gh-fr9f-867h

An issue was discovered in Squid before 5.0.2.

Priority MEDIUM 64CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 7 fixed, 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-190 and the CVSS impact.

Summary

An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the attacker can overflow the nonce reference counter (a short integer). Remote code execution may occur if the pooled token credentials are freed (instead of replayed as valid credentials).

Why it matters now

EPSS 0.27246 98th percentileScored 2026-11-07
Fix Partial Red Hat: 4 advisoriesRed Hat: 7 fixed, 2 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 11

CPEVersionsRoleVendor
cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*3.0 – 3.5.28; 4.0 to before 4.11; 5.0 to before 5.0.2Vulnerablesquid-cache
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*15.1VulnerableopenSUSE
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*30VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*31VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*32VulnerableFedoraproject
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*19.10VulnerableCanonical
  • cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* Versions 3.0 – 3.5.28; 4.0 to before 4.11; 5.0 to before 5.0.2 Vulnerable ·squid-cache
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
  • cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·openSUSE
  • cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* Versions 30 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Versions 31 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* Versions 19.10 Vulnerable ·Canonical
Show 1 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*20.04VulnerableCanonical
  • cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* Versions 20.04 Vulnerable ·Canonical

Remediation

Red Hat 4 advisories

  • RHSA-2020:2040 Released 2020-05-06 · Red Hat rating Important
    squid security update
    • Red Hat Enterprise Linux Server (v. 7) squid-7:3.5.20-15.el7_8.1, squid-migration-script-7:3.5.20-15.el7_8.1
    • Red Hat Enterprise Linux Server Optional (v. 7) squid-sysvinit-7:3.5.20-15.el7_8.1
    • Red Hat Enterprise Linux Workstation (v. 7) squid-7:3.5.20-15.el7_8.1, squid-migration-script-7:3.5.20-15.el7_8.1
    • Red Hat Enterprise Linux Workstation Optional (v. 7) squid-sysvinit-7:3.5.20-15.el7_8.1
  • RHSA-2020:2041 Released 2020-05-06 · Red Hat rating Important
    squid:4 security update
    • Red Hat Enterprise Linux AppStream (v. 8) libecap-1.0.1-2.module+el8.1.0+4044+36416a77.aarch64::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.ppc64le::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.s390x::squid:4 +11
  • RHSA-2020:2039 Released 2020-05-06 · Red Hat rating Important
    squid:4 security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.1) libecap-1.0.1-2.module+el8.1.0+4044+36416a77.aarch64::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.ppc64le::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.s390x::squid:4 +11
Show 1 more Red Hat advisories
  • RHSA-2020:2038 Released 2020-05-06 · Red Hat rating Important
    squid:4 security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.0) libecap-1.0.1-2.module+el8.0.0+4045+70edde92.ppc64le::squid:4, libecap-1.0.1-2.module+el8.0.0+4045+70edde92.src::squid:4, libecap-1.0.1-2.module+el8.0.0+4045+70edde92.x86_64::squid:4 +5

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 6AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2020:2041
Red Hat Enterprise Linux AppStream E4S (v. 8.0)Fixed RHSA-2020:2038
Red Hat Enterprise Linux AppStream EUS (v. 8.1)Fixed RHSA-2020:2039
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:2040
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2020:2040
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:2040
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2020:2040

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-11945
  2. 2026-10-03 Alias added: GHSA-82gh-fr9f-867h

References

Patch 3

Advisory 12

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences