Is CVE-2021-28651 actively exploited?

CVE-2021-28651 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2021-28651?

CVE-2021-28651 has a CVSS score of 7.5 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

How do I patch CVE-2021-28651?

Patch guidance is available from squid-cache security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-28651.

Fix CVE-2021-28651 - HIGH squid-cache squid

Q: Which products are affected by CVE-2021-28651?

7 products: squid-cache squid, squid-cache squid, debian debian linux, debian debian linux, fedoraproject fedora, and 2 more.

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
Weaknesses: CWE-401

Metadata

Primary Vendor: SQUID-CACHE
Published: 5/27/2021
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

squid-cache : squidsquid-cache : squiddebian : debian_linuxdebian : debian_linuxfedoraproject : fedorafedoraproject : fedoranetapp : cloud_manager

Remediation Guidance

Executive Summary

Cite this page

CVE-2021-28651. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2021-28651

View on NIST NVD

CVE-2021-28651 vulnerability