CVE-2020-15811

squid: HTTP Request Splitting could result in cache poisoning

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Severity

Important

Red Hat Product Security

9.6

CVSS 3.1

Review impact separately from score.

Published · August 23, 2020

Updated · November 21, 2025

Description

A flaw was found in squid. Due to incorrect data validation, an HTTP Request Splitting attack against HTTP and HTTPS traffic is possible leading to cache poisoning. The highest threat from this vulnerability is to data confidentiality and integrity.

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

Disable the relaxed HTTP parser in squid.conf:

relaxed_header_parser off

CVSS / CWE

CVSS 3.1 · 9.6
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')