CVE-2026-20048 (GCVE-0-2026-20048)
Vulnerability from cvelistv5 – Published: 2026-02-25 16:26 – Updated: 2026-02-25 19:05
VLAI?
Title
Cisco NX-OS Software SNMP Denial of Service Vulnerability
Summary
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.
Severity ?
7.7 (High)
CWE
- CWE-789 - Uncontrolled Memory Allocation
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Cisco | Cisco NX-OS System Software in ACI Mode |
Affected:
15.2(1g)
Affected: 15.2(2e) Affected: 15.2(2f) Affected: 15.2(2g) Affected: 15.2(2h) Affected: 15.2(3f) Affected: 15.2(3e) Affected: 15.2(3g) Affected: 15.2(4d) Affected: 15.2(4e) Affected: 15.2(5c) Affected: 15.2(5d) Affected: 16.0(1g) Affected: 15.2(5e) Affected: 15.2(4f) Affected: 15.2(6e) Affected: 15.2(6h) Affected: 16.0(1j) Affected: 15.2(6g) Affected: 15.2(7f) Affected: 15.2(7g) Affected: 16.0(2h) Affected: 15.2(8d) Affected: 16.0(2j) Affected: 15.2(8e) Affected: 16.0(3d) Affected: 16.0(3e) Affected: 15.2(8f) Affected: 15.2(8g) Affected: 15.3(1d) Affected: 15.2(8h) Affected: 16.0(4c) Affected: 15.3(2a) Affected: 15.2(8i) Affected: 16.0(5h) Affected: 15.3(2b) Affected: 16.0(3g) Affected: 16.0(5j) Affected: 15.3(2c) Affected: 16.0(6c) Affected: 15.3(2d) Affected: 16.1(1f) Affected: 16.0(7e) Affected: 16.0(8e) Affected: 15.3(2e) Affected: 16.0(8f) Affected: 16.1(2f) Affected: 16.1(2g) Affected: 15.3(2f) Affected: 16.0(9c) Affected: 16.1(3f) Affected: 16.0(9d) Affected: 16.0(6h) Affected: 16.0(8h) Affected: 16.1(3g) Affected: 16.0(9e) Affected: 16.1(4h) |
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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