Squid <= 3.2.x / 3.3.x / 3.4.x / 3.5.x <= 3.5.28 / 4.x < 4.4 Denial of Service Vulnerability (SQUID-2018:5)

Medium Nessus Plugin ID 119727

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VPR Score: 3.6


The remote proxy server is affected by a denial of service vulnerability.


According to its banner, the version of Squid running on the remote host is 3.2.x after or equal to, 3.3.x, 3.4.x, 3.5.x prior or equal to 3.5.28, or 4.x prior to 4.4. It is, therefore, affected by a denial of service (DoS) vulnerability in the SNMP component due to a memory leak in SNMP query rejection code. An unauthenticated, remote attacker can exploit this issue to consume all memory available to the Squid process, causing it to crash.

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 4.4 or later. Alternatively, apply the vendor-supplied patch.

See Also


Plugin Details

Severity: Medium

ID: 119727

File Name: squid_2018_5.nasl

Version: 1.2

Type: remote

Family: Firewalls

Published: 2018/12/17

Updated: 2019/10/31

Dependencies: 49692

Configuration: Enable paranoid mode

Risk Information

Risk Factor: Medium

VPR Score: 3.6

CVSS Score Source: CVE-2018-19132

CVSS v2.0

Base Score: 4.3

Temporal Score: 3.2

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 5.9

Temporal Score: 5.2

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

Temporal Vector: CVSS:3.0/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: 2016/10/23

Vulnerability Publication Date: 2018/10/28

Reference Information

CVE: CVE-2018-19132