Read the docs
TI-2024-30769 Aliases CVE-2024-45802

Squid Denial of Service

Priority HIGH 69CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 15 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to Input Validation, Premature Release of Resource During Expected Lifetime, and Missing Release of Resource after Effective Lifetime bugs, Squid is vulnerable to Denial of Service attacks by a trusted server against all clients using the proxy. This bug is fixed in the default build configuration of Squid version 6.10.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.47879 98th percentileScored 2026-11-07
Fix Partial squid (squid-cache): 6.10Red Hat: 10 advisoriesRed Hat: 15 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
squid-cachesquid3.0 to before 6.106.10Patch availableCNA
  • squid Vendorsquid-cache Affected 3.0 to before 6.10 Fixed in 6.10 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*3.0 to before 6.10Vulnerablesquid-cache
  • cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* Versions 3.0 to before 6.10 Vulnerable ·squid-cache

Remediation

  • Fix · CNA squid (squid-cache) Fixed in 6.10

Red Hat 10 advisories

  • RHSA-2024:9813 Released 2024-11-18 · Red Hat rating Important
    squid:4 security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.8) 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-2024:9815 Released 2024-11-18 · Red Hat rating Important
    squid:4 security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) libecap-1.0.1-2.module+el8.1.0+4044+36416a77.src::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.x86_64::squid:4, libecap-devel-1.0.1-2.module+el8.1.0+4044+36416a77.x86_64::squid:4 +2
    • Red Hat Enterprise Linux AppStream E4S (v.8.4) 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.src::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.x86_64::squid:4 +5
    • Red Hat Enterprise Linux AppStream TUS (v.8.4) libecap-1.0.1-2.module+el8.1.0+4044+36416a77.src::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.x86_64::squid:4, libecap-devel-1.0.1-2.module+el8.1.0+4044+36416a77.x86_64::squid:4 +2
  • RHSA-2024:9814 Released 2024-11-18 · Red Hat rating Important
    squid:4 security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) libecap-1.0.1-2.module+el8.1.0+4044+36416a77.src::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.x86_64::squid:4, libecap-devel-1.0.1-2.module+el8.1.0+4044+36416a77.x86_64::squid:4 +2
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) 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
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) libecap-1.0.1-2.module+el8.1.0+4044+36416a77.src::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.x86_64::squid:4, libecap-devel-1.0.1-2.module+el8.1.0+4044+36416a77.x86_64::squid:4 +2
Show 7 more Red Hat advisories
  • RHSA-2024:9738 Released 2024-11-14 · Red Hat rating Important
    squid security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) squid-7:3.5.20-17.el7_9.11, squid-migration-script-7:3.5.20-17.el7_9.11
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) squid-sysvinit-7:3.5.20-17.el7_9.11
  • RHSA-2024:9729 Released 2024-11-14 · Red Hat rating Important
    squid security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) squid-7:5.2-1.el9_0.7
  • RHSA-2024:9678 Released 2024-11-14 · Red Hat rating Important
    squid security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) squid-7:5.5-13.el9_4.2
  • RHSA-2024:9677 Released 2024-11-14 · Red Hat rating Important
    squid security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.2) squid-7:5.5-5.el9_2.8
  • RHSA-2024:9644 Released 2024-11-14 · Red Hat rating Important
    squid:4 security update
    • Red Hat Enterprise Linux AppStream (v. 8) libecap-1.0.1-2.module+el8.9.0+19703+a1da7223.aarch64::squid:4, libecap-1.0.1-2.module+el8.9.0+19703+a1da7223.ppc64le::squid:4, libecap-1.0.1-2.module+el8.9.0+19703+a1da7223.s390x::squid:4 +11
  • RHSA-2024:9625 Released 2024-11-14 · Red Hat rating Important
    squid security update
    • Red Hat Enterprise Linux AppStream (v. 9) squid-7:5.5-14.el9_5.3
  • RHSA-2024:9624 Released 2024-11-14 · Red Hat rating Important
    squid:4 security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) libecap-1.0.1-2.module+el8.1.0+4044+36416a77.src::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.x86_64::squid:4, libecap-devel-1.0.1-2.module+el8.1.0+4044+36416a77.x86_64::squid:4 +2

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2024:9644
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2024:9625
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2024:9624
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2024:9815
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2024:9814
Red Hat Enterprise Linux AppStream E4S (v.8.4)Fixed RHSA-2024:9815
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2024:9814
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2024:9729
Red Hat Enterprise Linux AppStream EUS (v.8.8)Fixed RHSA-2024:9813
Red Hat Enterprise Linux AppStream EUS (v.9.2)Fixed RHSA-2024:9677
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2024:9678
Red Hat Enterprise Linux AppStream TUS (v.8.4)Fixed RHSA-2024:9815
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2024:9814
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2024:9738
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2024:9738
Not affected: 1 product
  • Red Hat Enterprise Linux 10

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-45802
  2. 2026-11-06 Fix available: RHSA-2024:9624 · Red Hat
  3. 2026-11-06 Fix available: RHSA-2024:9678 · Red Hat

References

Advisory 1

  • TI-2025-38486 Squid vulnerable to information disclosure via authentication credential leakage in error handling CVSS 3.1CRITICAL 10.0
  • TI-2024-16845 Denial of Service in HTTP Header parser in squid proxy CVSS 3.1HIGH 7.5
  • TI-2024-16566 SQUID-2024:1 Denial of Service in HTTP Chunked Decoding CVSS 3.1HIGH 8.6
  • TI-2023-26921 Denial of Service in HTTP Message Processing in Squid CVSS 3.1HIGH 8.6
  • TI-2023-27496 SQUID-2023:10 Denial of Service in HTTP Request parsing CVSS 3.1HIGH 8.6
  • TI-2023-25306 Squid: denial of service in http digest authentication CVSS 3.1HIGH 8.6
See all 110 →

Sources

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