CVE Database›Document archive›CVE-2020-8517

CVE-2020-8517

squid: Buffer Overflow in ext_lm_group_acl helper

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Severity

Important

Red Hat Product Security

8.1

CVSS 3.1

Review impact separately from score.

Published · February 2, 2020

Updated · November 22, 2025

Description

An issue was discovered in Squid before 4.10. Due to incorrect input validation, the NTLM authentication credentials parser in ext_lm_group_acl may write to memory outside the credentials buffer. On systems with memory access protections, this can result in the helper process being terminated unexpectedly. This leads to the Squid process also terminating and a denial of service for all clients using the proxy.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer