Squid 2.x < 4.13 / 5.x < 5.0.4 (SQUID-2020:8 and SQUID-2020:10)

medium Nessus Plugin ID 139923
New! Plugin Severity Now Using CVSS v3

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The remote proxy server is affected by multiple vulnerabilities


According to its banner, the version of Squid running on the remote host is 2.x prior to 4.13 or 5.x prior to 5.0.4. It is,therefore, affected by multiple vulnerabilities:

- An input-validation flaw exists related to handling HTTP and HTTPS traffic that allows HTTP request splitting leading to cache poisoning. (CVE-2020-15810)

- An input-validation flaw exists related to handling HTTP and HTTPS traffic that allows HTTP request smuggling leading to cache poisoning. (CVE-2020-15811)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Upgrade to Squid version 4.13 or 5.0.4 or later.

See Also



Plugin Details

Severity: Medium

ID: 139923

File Name: squid_5_0_4.nasl

Version: 1.4

Type: remote

Family: Firewalls

Published: 8/28/2020

Updated: 6/3/2021

Dependencies: squid_version.nasl

Configuration: Enable paranoid mode

Risk Information

CVSS Score Source: CVE-2020-15811


Risk Factor: Medium

Score: 4.4


Risk Factor: Medium

Base Score: 4

Temporal Score: 3

Vector: AV:N/AC:L/Au:S/C:N/I:P/A:N

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:squid-cache:squid

Required KB Items: installed_sw/Squid, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 8/22/2020

Vulnerability Publication Date: 8/22/2020

Reference Information

CVE: CVE-2020-15810, CVE-2020-15811

IAVB: 2020-B-0050-S