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CVE-2024-23638

51
FAUCET Score

CVE-2024-23638 is a Denial of Service (DoS) vulnerability affecting Squid caching proxy versions prior to 6.6, and all 5.x versions up to 5.9. This flaw stems from an expired pointer reference bug when generating error pages for Cache Manager reports, allowing a trusted client to trigger a DoS. Rated Medium severity (CVSS 6.5), it requires low privileges and network access for exploitation, leading to high availability impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.0, <= 5.9CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*
>= 6.0, < 6.6CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
60.05%
Probability of exploitation in next 30 days
EPSS Percentile
99.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.6005 is in the 100th percentile among its peer group of 21,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: squid:4-8100020241113143337.489197e6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: squid-7:5.5-13.el9_4
View patch

Vendor Advisories (1)

redhatCVE-2024-23638Moderate

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

Jan 24, 2024

References

github.com / squid-cache/squid/commit/290ae202883ac28a48867079c2fb34c40efd382b
Patch
github.com / squid-cache/squid/commit/e8118a7381213f5cfcdeb4cec1d2d854bfd261c8
Patch
github.com / squid-cache/squid/security/advisories/GHSA-j49p-553x-48rx
Vendor Advisory
lists.fedoraproject.org / archives/list/[email protected]/message/7R4KPSO3MQT3KAOZV7LC2GG3CYMCGK7H
lists.fedoraproject.org / archives/list/[email protected]/message/XWQHRDRHDM5PQTU6BHH4C5KGL37X6TVI
megamansec.github.io / Squid-Security-Audit/stream-assert.html
Exploit
security.netapp.com / advisory/ntap-20240208-0010
squid-cache.org / Versions/v5/SQUID-2023_11.patch
Mailing ListPatch
squid-cache.org / Versions/v6/SQUID-2023_11.patch
Mailing ListPatch