CVE-2021-28651

HIGH

Squid < 4.15 - Memory Leak

Title source: rule

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)

[Mailing List, Third Party Advisory] http://seclists.org/fulldisclosure/2023/Oct/14

[Mailing List, Third Party Advisory] http://www.openwall.com/lists/oss-security/2023/10/11/3

[Exploit, Issue Tracking, Vendor Advisory] https://bugs.squid-cache.org/show_bug.cgi?id=5104

[Patch, Third Party Advisory] https://github.com/squid-cache/squid/security/advisories/GHSA-ch36-9jhx-phm4

[Mailing List, Third Party Advisory] https://lists.debian.org/debian-lts-announce/2021/06/msg00014.html

[Third Party Advisory] https://security.netapp.com/advisory/ntap-20210716-0007/

[Third Party Advisory] https://www.debian.org/security/2021/dsa-4924

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/

Scores

CVSS v3 7.5

EPSS 0.0616

EPSS Percentile 90.7%

Attack Vector NETWORK

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

Classification

CWE

CWE-401

Status published

Affected Products (6)

squid-cache/squid < 4.15

debian/debian_linux

debian/debian_linux

fedoraproject/fedora

fedoraproject/fedora

netapp/cloud_manager

Timeline

Published May 27, 2021

Tracked Since Feb 18, 2026