Is CVE-2024-23638 in the CISA KEV catalog?

No. CVE-2024-23638 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-23638?

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

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

CVE-2024-23638 has an EPSS score of 60.05% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-23638?

Upgrade squid on debian 11 to 4.13-10+deb11u3 or later. Fixes are available for 16 affected products.

CVE & CISA-KEV Catalog

CVE-2024-23638

MEDIUMEPSS 99th pctl

6.5

CVSS v3

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`.

CWE-825 CWE-672

How to fix

Remediation Available

squidDebian

Fixed in:4.13-10+deb11u3CVE-2024-23638

Fixed in:5.7-2+deb12u1CVE-2024-23638

Fixed in:6.6-1CVE-2024-23638

libecapRed Hat / RHEL

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.aarch64::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.ppc64le::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.src::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.s390x::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.x86_64::squid:4RHSA-2024:9644

libecapRocky

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.x86_64::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.s390x::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.ppc64le::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.src::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.aarch64::squid:4RHSA-2024:9644

libecap-debuginfoRed Hat / RHEL

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.ppc64le::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.x86_64::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.s390x::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.aarch64::squid:4RHSA-2024:9644

libecap-debuginfoRocky

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.x86_64::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.s390x::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.ppc64le::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.aarch64::squid:4RHSA-2024:9644

libecap-debugsourceRocky

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.ppc64le::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.x86_64::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.aarch64::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.s390x::squid:4RHSA-2024:9644

libecap-debugsourceRed Hat / RHEL

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.s390x::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.ppc64le::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.aarch64::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.x86_64::squid:4RHSA-2024:9644

libecap-develRed Hat / RHEL

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.x86_64::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.aarch64::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.s390x::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.ppc64le::squid:4RHSA-2024:9644

libecap-develRocky

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.ppc64le::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.s390x::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.x86_64::squid:4RHSA-2024:9644

Fixed in:0:1.0.1-2.module+el8.9.0+19703+a1da7223.aarch64::squid:4RHSA-2024:9644

squidRed Hat / RHEL

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.aarch64::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.src::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.ppc64le::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.s390x::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.x86_64::squid:4RHSA-2024:9644

Fixed in:7:5.5-13.el9_4RHSA-2024:4861

squidRocky

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.src::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.aarch64::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.ppc64le::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.s390x::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.x86_64::squid:4RHSA-2024:9644

Fixed in:7:5.5-13.el9_4RHSA-2024:4861

squid-debuginfoRed Hat / RHEL

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.ppc64le::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.aarch64::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.x86_64::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.s390x::squid:4RHSA-2024:9644

Fixed in:7:5.5-13.el9_4RHSA-2024:4861

squid-debuginfoRocky

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.aarch64::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.s390x::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.x86_64::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.ppc64le::squid:4RHSA-2024:9644

Fixed in:7:5.5-13.el9_4RHSA-2024:4861

squid-debugsourceRed Hat / RHEL

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.ppc64le::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.s390x::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.x86_64::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.aarch64::squid:4RHSA-2024:9644

Fixed in:7:5.5-13.el9_4RHSA-2024:4861

squid-debugsourceRocky

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.ppc64le::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.s390x::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.x86_64::squid:4RHSA-2024:9644

Fixed in:7:4.15-10.module+el8.10.0+22489+b920747d.3.aarch64::squid:4RHSA-2024:9644

Fixed in:7:5.5-13.el9_4RHSA-2024:4861

squidUbuntu

Fixed in:4.10-1ubuntu1.10USN-6728-1

Fixed in:5.7-0ubuntu0.22.04.4USN-6728-1

Fixed in:6.1-2ubuntu1.3USN-6728-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

60.05%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Patch4

Exploit1

megamansec.github.io

Vendor Advisory1

github.com

Other references3

Related Vulnerabilities

Other CWE-825 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2026-33526	High	7.5	8.9%	-	Fix
CVE-2019-15691	High	7.2	4.7%	-	Fix
CVE-2023-48316	Critical	9.8	4.3%	-	Fix
CVE-2023-48315	High	8.8	3.9%	-	Fix
CVE-2023-48692	Critical	9.0	3.1%	-	Fix
CVE-2026-45447	High	8.8	2.7%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.