Detections
Analytics
Cisco IOS XE Software SNMP DoS (cisco-sa-iosxe-snmp-dos-ZAqNm4MD)
high Nessus Plugin ID 333338
Synopsis
The remote device is missing a vendor-supplied security patch.Description
According to its self-reported version, Cisco IOS XE Software is affected by a vulnerability.- A vulnerability in the SNMP subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition. This vulnerability affects SNMP versions 1, 2c, and 3. To exploit this vulnerability through SNMP v2c or earlier, the attacker must know a valid read-write or read-only SNMP community string for the affected system. To exploit this vulnerability through SNMP v3, the attacker must have valid SNMP user credentials for the affected system.
(CVE-2026-20124)
Please see the included Cisco BIDs and Cisco Security Advisory for more information.
Solution
Upgrade to the relevant fixed version referenced in Cisco bug ID CSCws90638See Also
Plugin Details
Severity: High
ID: 333338
File Name: cisco-sa-iosxe-snmp-dos-ZAqNm4MD-iosxe.nasl
Version: 1.1
Type: Combined
Family: CISCO
Published: 8/7/2026
Updated: 8/7/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.3
Percentile: 51.03
CVSS v2
Risk Factor: Medium
Base Score: 6.8
Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C
CVSS Score Source: CVE-2026-20124
CVSS v3
Risk Factor: High
Base Score: 7.7
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Vulnerability Information
CPE: cpe:/o:cisco:ios_xe
Required KB Items: Host/Cisco/IOS-XE/Version
Patch Publication Date: 8/5/2026
Vulnerability Publication Date: 8/5/2026
Reference Information
CVE: CVE-2026-20124