CVE-2021-28652

Public Exploit

Description

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This attack is limited to clients with Cache Manager API access privilege.

Category

4.9
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.84% Top 30%
Vendor Advisory debian.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory squid-cache.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://bugs.squid-cache.org/show_bug.cgi?id=5106 vendor advisory issue tracking exploit
https://github.com/squid-cache/squid/security/advisories/GHSA-m47m-9hvw-7447 third party advisory patch
https://www.debian.org/security/2021/dsa-4924 third party advisory vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/ vendor advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00014.html third party advisory mailing list
http://www.openwall.com/lists/oss-security/2023/10/11/3 third party advisory mailing list
http://seclists.org/fulldisclosure/2023/Oct/14 third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2021-28652?
CVE-2021-28652 has been scored as a medium severity vulnerability.
How to fix CVE-2021-28652?
To fix CVE-2021-28652, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-28652 being actively exploited in the wild?
It is possible that CVE-2021-28652 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.