Cisco IOS Software Split DNS DoS (cisco-sa-splitdns-SPWqpdGW)

high Nessus Plugin ID 141170
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VPR Score: 4.4


The remote device is missing a vendor-supplied security patch.


According to its self-reported version, Cisco IOS Software is affected by a denial of service (DoS) vulnerability as the Split DNS feature's regular expression (regex) engine may time out when processing the DNS name list configuration.
An unauthenticated, remote attacker could cause an affected device to reload, resulting in a denial of service.

Please see the included Cisco BID and Cisco Security Advisory for more information.


Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvt78186

See Also

Plugin Details

Severity: High

ID: 141170

File Name: cisco-sa-splitdns-SPWqpdGW-ios.nasl

Version: 1.12

Type: combined

Family: CISCO

Published: 10/5/2020

Updated: 1/14/2021

Dependencies: cisco_ios_version.nasl

Risk Information

Risk Factor: High

VPR Score: 4.4

CVSS Score Source: CVE-2020-3408

CVSS v2.0

Base Score: 7.8

Temporal Score: 5.8

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

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

CVSS v3.0

Base Score: 8.6

Temporal Score: 7.5

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

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

Vulnerability Information

CPE: cpe:/o:cisco:ios

Required KB Items: Host/Cisco/IOS/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 9/24/2020

Vulnerability Publication Date: 9/24/2020

Reference Information

CVE: CVE-2020-3408


CISCO-SA: cisco-sa-splitdns-SPWqpdGW

IAVA: 2020-A-0439

CWE: 185