Detections
Analytics

Cisco Nexus 9000 Series Fabric Switches in ACI Mode SNMP DoS (cisco-sa-nxos-dsnmp-cNN39Uh)

high Nessus Plugin ID 305302

Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco NX-OS System Software in ACI Mode is affected by a vulnerability.

 - A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper processing when parsing SNMP requests. An attacker could exploit this vulnerability by continuously sending SNMP queriesto a specific MIB of an affected device. A successful exploit could allow the attacker to cause a kernel panic on the device, resulting in a reload and aDoS condition. Note: This vulnerability affects SNMP versions 1, 2c, and 3. To exploitthis vulnerability through SNMPv1 orSNMPv2c, the attacker must have a valid read-only SNMP community string for the affected system. To exploit this vulnerability through SNMPv3, the attacker must have valid SNMP user credentials for the affected system.
 (CVE-2026-20048)

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 CSCwq57598

See Also

http://www.nessus.org/u?62fdf41b

http://www.nessus.org/u?1f4e7e33

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq57598

Plugin Details

Severity: High

ID: 305302

File Name: cisco-sa-nxos-dsnmp-cNN39Uh.nasl

Version: 1.1

Type: Combined

Family: CISCO

Published: 4/8/2026

Updated: 4/8/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

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-2026-20048

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:nx-os

Required KB Items: Settings/ParanoidReport, Host/Cisco/NX-OS/Version, Host/Cisco/NX-OS/Model, Host/Cisco/NX-OS/Device

Exploit Ease: No known exploits are available

Patch Publication Date: 2/25/2026

Vulnerability Publication Date: 2/25/2026

Reference Information

CVE: CVE-2026-20048

CWE: 789

CISCO-SA: cisco-sa-nxos-dsnmp-cNN39Uh

CISCO-BUG-ID: CSCwq57598