Is CVE-2021-31806 actively exploited?

CVE-2021-31806 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2021-31806?

CVE-2021-31806 has a CVSS score of 6.5 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

How do I patch CVE-2021-31806?

Patch guidance is available from squid-cache security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-31806.

CVE-2021-31806 - remediation guidance & executive summary

Q: Which products are affected by CVE-2021-31806?

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 memory-management bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request processing.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector: network
Complexity: low
Privileges: low
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
Weaknesses: CWE-116

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-2021-31806. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2021-31806

View on NIST NVD

CVE-2021-31806 vulnerability