CVE-2026-20048 is a vulnerability in Cisco Nx Os
Published on February 25, 2026
Cisco NX-OS Software SNMP Denial of Service 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 queries to 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 a DoS condition.
Note: This vulnerability affects SNMP versions 1, 2c, and 3. To exploit this vulnerability through SNMPv1 or SNMPv2c, 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.
Vulnerability Analysis
CVE-2026-20048 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a Stack Exhaustion Vulnerability?
The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.
CVE-2026-20048 has been classified to as a Stack Exhaustion vulnerability or weakness.
Products Associated with CVE-2026-20048
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Affected Versions
Cisco NX-OS System Software in ACI Mode:- Version 15.2(1g) is affected.
- Version 15.2(2e) is affected.
- Version 15.2(2f) is affected.
- Version 15.2(2g) is affected.
- Version 15.2(2h) is affected.
- Version 15.2(3f) is affected.
- Version 15.2(3e) is affected.
- Version 15.2(3g) is affected.
- Version 15.2(4d) is affected.
- Version 15.2(4e) is affected.
- Version 15.2(5c) is affected.
- Version 15.2(5d) is affected.
- Version 16.0(1g) is affected.
- Version 15.2(5e) is affected.
- Version 15.2(4f) is affected.
- Version 15.2(6e) is affected.
- Version 15.2(6h) is affected.
- Version 16.0(1j) is affected.
- Version 15.2(6g) is affected.
- Version 15.2(7f) is affected.
- Version 15.2(7g) is affected.
- Version 16.0(2h) is affected.
- Version 15.2(8d) is affected.
- Version 16.0(2j) is affected.
- Version 15.2(8e) is affected.
- Version 16.0(3d) is affected.
- Version 16.0(3e) is affected.
- Version 15.2(8f) is affected.
- Version 15.2(8g) is affected.
- Version 15.3(1d) is affected.
- Version 15.2(8h) is affected.
- Version 16.0(4c) is affected.
- Version 15.3(2a) is affected.
- Version 15.2(8i) is affected.
- Version 16.0(5h) is affected.
- Version 15.3(2b) is affected.
- Version 16.0(3g) is affected.
- Version 16.0(5j) is affected.
- Version 15.3(2c) is affected.
- Version 16.0(6c) is affected.
- Version 15.3(2d) is affected.
- Version 16.1(1f) is affected.
- Version 16.0(7e) is affected.
- Version 16.0(8e) is affected.
- Version 15.3(2e) is affected.
- Version 16.0(8f) is affected.
- Version 16.1(2f) is affected.
- Version 16.1(2g) is affected.
- Version 15.3(2f) is affected.
- Version 16.0(9c) is affected.
- Version 16.1(3f) is affected.
- Version 16.0(9d) is affected.
- Version 16.0(6h) is affected.
- Version 16.0(8h) is affected.
- Version 16.1(3g) is affected.
- Version 16.0(9e) is affected.
- Version 16.1(4h) is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.