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MEDIUM

CVE-2024-23638

CVSS v3

6.5

MEDIUM

EPSS Score

60.1 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libecapAlmaLinux:8all versions · fixed in 1.0.1-2.module_el8.6.0+3048+383bc947and 1 other package
  • squidAlmaLinux:9all versions · fixed in 7:5.5-13.el9_4
  • squidAlmaLinux:8all versions · fixed in 7:4.15-10.module_el8.10.0+3916+ed00a4a0.3

Vendor advisories

  • CVE-2024-23638 Red Hat Product Security43 products fixed · 8 known affected

    squid: vulnerable to a Denial of Service attack against Cache Manager error responses

    squid as a component of Red Hat Enterprise Linux 6 · squid.src as a component of Red Hat Enterprise Linux 6 · squid34 as a component of Red Hat Enterprise Linux 6

  • RHSA-2024:9644 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: squid:4 security update

  • RHSA-2024:4861 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: squid security update

Full record on NVD

Description

Squid is a caching proxy for the Web. Due to an expired pointer reference bug, Squid prior to version 6.6 is vulnerable to a Denial of Service attack against Cache Manager error responses. This problem allows a trusted client to perform Denial of Service when generating error pages for Client Manager reports. Squid older than 5.0.5 have not been tested and should be assumed to be vulnerable. All Squid-5.x up to and including 5.9 are vulnerable. All Squid-6.x up to and including 6.5 are vulnerable. This bug is fixed by Squid version 6.6. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives. As a workaround, prevent access to Cache Manager using Squid's main access control: `http_access deny manager`.

Technical details

Published
2024-01-24

Frequently asked questions

What is CVE-2024-23638?

Squid is a caching proxy for the Web. Due to an expired pointer reference bug, Squid prior to version 6.6 is vulnerable to a Denial of Service attack against Cache Manager error responses. This problem allows a trusted client to perform Denial of Service when generating error pages for Client Manager reports. Squid older than 5.0.5 have not been tested and should be assumed to be vulnerable. All Squid-5.x up to and including 5.9 are vulnerable. All Squid-6.x up to and including 6.5 are vulnerable. This bug is fixed by Squid version 6.6. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives. As a workaround, prevent access to Cache Manager using Squid's main access control: `http_access deny manager`.

Is CVE-2024-23638 actively exploited?

Active exploitation of CVE-2024-23638 has not been confirmed. Its EPSS score was 60.1% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2024-23638?

CVE-2024-23638 has a CVSS v3 base score of 6.5 (MEDIUM severity).

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