CVE-2026-20033 (GCVE-0-2026-20033)

Vulnerability from cvelistv5 – Published: 2026-02-25 16:26 – Updated: 2026-02-25 19:05
VLAI?
Title
Cisco NX-OS Software Denial of Service Vulnerability
Summary
A vulnerability in Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation when processing specific Ethernet frames. An attacker could exploit this vulnerability by sending a crafted Ethernet frame to the management interface of an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition. Note: Only the out-of-band (OOB) management interface is affected.
Severity ?
7.4 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE
  • CWE-805 - Buffer Access with Incorrect Length Value
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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                "id": "CVE-2026-20033",
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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.
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  • 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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