CVE-2026-20173

mediumpriority · track · 23EPSS 0.004 · 31 %ileDENLRUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.37% (31st) EPSS
CVSS 5.8 · medium
Is it mine?
296 products
Check your exposure
Who says so?
4 sources
fstec_bdu · cert_bund · cisco_csaf · ncsc_nl

EPSS · scored 2026-10-27

A vulnerability in Cisco NX-OS Software could allow an unauthenticated, remote attacker to exhaust system resources, causing a denial of service (DoS) condition. This vulnerability exists because rate limiting was improperly applied to some protocols. An attacker could exploit this vulnerability by sending a high rate of UDP or TCP connections to a data plane interface on an affected device. A successful exploit could allow the attacker to cause instability to various routing and control plane protocols through some packet loss and temporary disruptions, causing a DoS condition. This DoS condition will clear without manual intervention soon after the high rate of traffic is stopped.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

02

cvss

Technical severity, 0–10. One row per scoring source.

5.8
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Lprimary · psirt@cisco.com USexploitability 3.9 · impact 1.4
v3.15.8mediumAV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L/E:Usecondary · CVSS-BT (t0sche)
v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Lsecondary · NCSC-NL NL
v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Lsecondary · Cisco PSIRT US
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-770USCWE-770USCWE-770US
05

affected products (296)

Products and version ranges known to be affected.

showing 20 of 296
06

advisories (3)

Vendor and ecosystem advisories describing this.

  • NCSC-2026-0406Kwetsbaarheden verholpen in Cisco NX-OS SoftwareNL2026-10-08csaf · ncsc_nlNL

    Cisco heeft meerdere kwetsbaarheden verholpen in Cisco NX-OS Software.

  • WID-SEC-W-2026-3810Cisco Nexus und Cisco NX-OS: Mehrere SchwachstellenDeutsch2026-10-07csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Cisco Nexus und Cisco NX-OS ausnutzen, um beliebigen Code auszuführen, erweiterte Berechtigungen zu erlangen, Sicherheitsmaßnahmen zu umgehen, Daten offenzulegen und zu manipulieren oder Denial-of-Service-Zustände herbeizuführen.

  • cisco-sa-nxos-nscpdos-SnderkC7Cisco NX-OS Software Control Plane Denial of Service Vulnerability2026-10-07csaf · cisco_csafUS

    A vulnerability in Cisco NX-OS Software could allow an unauthenticated, remote attacker to exhaust system resources, causing a denial of service (DoS) condition. This vulnerability exists because rate limiting was improperly applied to some protocols. An attacker could exploit this vulnerability by sending a high rate of UDP or TCP connections to a data plane interface on an affected device. A successful exploit could allow the attacker to cause instability to various routing and control plane protocols through some packet loss and temporary disruptions, causing a DoS condition. This DoS condition will clear without manual intervention soon after the high rate of traffic is stopped. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of October 7, 2026, Security Advisories ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-notice-fBn58ELx"]. For further documentation of improvements and fixes in Cisco NX-OS Software, see Cisco NX-OS Software Security Hardening Release: October 2026 ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR"].

07

also known as (1)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

fstec_bducert_bundcisco_csafncsc_nlNVDCVE.orgMITRE
published 2026-10-07modified 2026-10-12
09

references (1) nvd

External citations — patches, advisories, analysis.

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