PT-2026-21949 · Cisco · Cisco Nexus 9000 Series Fabric Switches

Published 2026-02-25 · Updated 2026-02-26 · CVE-2026-20048

Positive Technologies (AI Summary)

CVSS v3.1

7.7

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Cisco Nexus 9000 Series Fabric Switches versions (affected versions not specified)

Description A flaw exists in the Simple Network Management Protocol (SNMP) subsystem of Cisco Nexus 9000 Series Fabric Switches operating in ACI mode. This issue could allow a remote attacker with valid credentials to trigger a denial of service (DoS) condition. The root cause is improper handling of SNMP requests during parsing. An attacker can exploit this by repeatedly sending SNMP queries to a specific Management Information Base (MIB) on the device. A successful exploit may lead to a kernel panic, causing the device to reload and become unavailable. This affects SNMP versions 1, 2c, and 3. Exploitation via SNMPv1 or SNMPv2c requires a valid read-only SNMP community string, while SNMPv3 exploitation requires valid SNMP user credentials.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Weakness Enumeration

CWE-789

Related Identifiers

CVE-2026-20048

Affected Products

Cisco Nexus 9000 Series Fabric Switches

References · 4

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-dsnmp-cNN39Uh · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-20048 · Security Note
• https://twitter.com/VulmonFeeds/status/2026793802518720866 · Twitter Post
• https://twitter.com/CVEnew/status/2027099319783047449 · Twitter Post