6.8

CVE-2026-20171

Medienbericht

Cisco Nexus 3000 and 9000 Series Border Gateway Protocol Denial of Service Vulnerability

A vulnerability in the Border Gateway Protocol (BGP) enforce-first-as feature of Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, remote attacker to trigger BGP peer flaps, resulting in a denial of service (DoS) condition.

This vulnerability is due to incorrect parsing of a transitive BGP attribute. An attacker could exploit this vulnerability by sending a crafted BGP update through an established BGP peer session. If the update propagates to an affected device, it could cause the device to drop the BGP session and flap with the BGP peer that is forwarding this update, resulting in a DoS condition.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerCisco
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Produkt Cisco NX-OS Software
Default Statusunknown
Version 10.2(1)
Status affected
Version 10.2(1q)
Status affected
Version 10.2(2)
Status affected
Version 10.2(3)
Status affected
Version 10.2(3t)
Status affected
Version 10.2(2a)
Status affected
Version 10.3(1)
Status affected
Version 10.2(4)
Status affected
Version 10.3(2)
Status affected
Version 10.3(3)
Status affected
Version 10.2(5)
Status affected
Version 10.2(3v)
Status affected
Version 10.4(1)
Status affected
Version 10.3(99w)
Status affected
Version 10.2(6)
Status affected
Version 10.3(3w)
Status affected
Version 10.3(99x)
Status affected
Version 10.3(3o)
Status affected
Version 10.3(4)
Status affected
Version 10.3(3p)
Status affected
Version 10.3(4a)
Status affected
Version 10.4(2)
Status affected
Version 10.3(3q)
Status affected
Version 10.3(5)
Status affected
Version 10.2(7)
Status affected
Version 10.4(3)
Status affected
Version 10.3(3x)
Status affected
Version 10.3(4g)
Status affected
Version 10.5(1)
Status affected
Version 10.2(8)
Status affected
Version 10.3(3r)
Status affected
Version 10.3(6)
Status affected
Version 10.4(4)
Status affected
Version 10.3(4h)
Status affected
Version 10.5(2)
Status affected
Version 10.3(7)
Status affected
Version 10.4(5)
Status affected
Version 10.5(3)
Status affected
Version 10.2(9)
Status affected
Version 10.4(4g)
Status affected
Version 10.6(1)
Status affected
Version 10.5(3t)
Status affected
Version 10.3(8)
Status affected
Version 10.4(6)
Status affected
Version 10.5(3s)
Status affected
Version 10.5(3e)
Status affected
Version 10.5(3o)
Status affected
Version 10.6(1s)
Status affected
Version 10.5(3p)
Status affected
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.47% 0.368
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
psirt@cisco.com 6.8 2.2 4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-670 Always-Incorrect Control Flow Implementation

The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated.

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Media Report
05.06.2026 12:43
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bgp-iefab-3hb2pwtx