CVE-2021-28651

HIGH

Squid < 4.15 and 5.x < 5.0.6 - Denial of Service via URN Scheme Memory Leak

Title source: llm
STIX 2.1

Description

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of memory consumption.

References (9)

Core 9
Core References
Third Party Advisory vendor-advisory
https://www.debian.org/security/2021/dsa-4924
Mailing List, Third Party Advisory mailing-list
https://lists.debian.org/debian-lts-announce/2021/06/msg00014.html
Mailing List, Third Party Advisory mailing-list
http://www.openwall.com/lists/oss-security/2023/10/11/3
Mailing List, Third Party Advisory mailing-list
http://seclists.org/fulldisclosure/2023/Oct/14
Exploit, Issue Tracking, Vendor Advisory
https://bugs.squid-cache.org/show_bug.cgi?id=5104

Scores

CVSS v3 7.5
EPSS 0.0613
EPSS Percentile 90.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-401
Status published
Products (6)
debian/debian_linux 9.0
debian/debian_linux 10.0
fedoraproject/fedora 33
fedoraproject/fedora 34
netapp/cloud_manager
squid-cache/squid 2.0 - 4.15
Published May 27, 2021
Tracked Since Feb 18, 2026