Squid 2.x < 4.12 / 5.x < 5.0.3 (SQUID-2020:5, SQUID-2020:6 & SQUID-2020:7)

high Nessus Plugin ID 139912
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


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 4.12 or 5.x prior to 5.0.3. It is,therefore, affected by multiple vulnerabilities:
- Multiple denial of service (DoS) vulnerabilities exist in the SMP cache and TLS handshake implementations of Squid. An unauthenticated, remote attacker can exploit these issues, by sending specially crafted requests to an affected instance, to impose a DoS condition on the application (CVE-2020-14058, CVE-2020-14059).

- A cache poisoning vulnerability exists in Squid due to insufficient user input validation. An authenticated, remote attacker can exploit this issue, to affect the integrity of the contents returned to users from the cache (CVE-2020-15049).

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 4.12 or 5.0.3 or later.

See Also




Plugin Details

Severity: High

ID: 139912

File Name: squid_5_0_3.nasl

Version: 1.3

Type: remote

Family: Firewalls

Published: 8/27/2020

Updated: 1/4/2021

Dependencies: squid_version.nasl

Configuration: Enable paranoid mode

Risk Information

CVSS Score Source: CVE-2020-15049


Risk Factor: Medium

Score: 5.9


Risk Factor: Medium

Base Score: 6.5

Temporal Score: 4.8

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

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


Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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: 6/26/2020

Vulnerability Publication Date: 6/26/2020

Reference Information

CVE: CVE-2020-14058, CVE-2020-14059, CVE-2020-15049