Squid 3.1.6 DNS Reply Denial of Service

Medium Nessus Plugin ID 48433

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VPR Score: 4.4


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


According to its banner, the version of the Squid proxy caching server installed on the remote host is 3.1.6. This version is affected by a denial of service vulnerability that is caused by an assertion failure when contacting IPv4-only DNS resolvers.

Note that Nessus has relied only on the version in the proxy server's banner, which is not updated by either of the patches the project has released to address this issue. If one of those has been applied properly and the service restarted, consider this to be a false positive.


Upgrade to Squid version 3.1.7 or later

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Plugin Details

Severity: Medium

ID: 48433

File Name: squid_3_1_7.nasl

Version: 1.14

Type: remote

Family: Firewalls

Published: 2010/08/25

Updated: 2018/11/15

Dependencies: 49692

Configuration: Enable paranoid mode

Risk Information

Risk Factor: Medium

VPR Score: 4.4

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

Vulnerability Information

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

Required KB Items: Settings/ParanoidReport

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2010/08/24

Vulnerability Publication Date: 2010/08/24

Reference Information

CVE: CVE-2010-2951

BID: 42645