5.8

CVE-2026-20173: cisco cisco nx-os software

CVSS: 5.8v3.1MediumAwaiting analysis
Published 07-10-2026Last modified 07-10-2026
Open JSON

Vulnerability summary

CVE-2026-20173 is a medium (CVSS 5.8) vulnerability in cisco cisco nx-os software. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 30% of scored vulnerabilities.

Overall risk
23/100
0100
Low · default modelHow is this calculated?
CVSS score
5.8/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.37%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 07-10-2026
    PublishedVulnerability first disclosed.
  2. 07-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

30%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

08-10-202621-10-2026
EPSS score
0.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco1 product
  • cisco nx-os software8.2(5) | 7.3(5)D1(1) | 8.4(2) | 8.4(3) | 9.2(3) | 9.2(2v) | 7.3(4)D1(1) | 8.2(1) | 9.2(1) | 9.2(2t) | 9.2(3y) | 9.3(2) | 8.1(1) | 8.2(2) | 8.3(2) | 7.3(2)D1(3a) | 9.2(4) | 8.1(2) | 7.3(3)D1(1) | 8.2(3) | 8.4(1) | 7.3(0)DX(1) | 7.3(2)D1(1) | 9.3(1) | 7.3(2)D1(2) | 8.2(4) | 9.3(1z) | 9.2(2) | 8.1(2a) | 7.3(2)D1(3) | 8.3(1) | 7.3(1)D1(1) | 7.3(0)D1(1) | 9.3(3) | 7.3(2)D1(1d) | 9.3(4) | 7.3(6)D1(1) | 8.2(6) | 9.3(5) | 9.3(6) | 8.4(4) | 7.3(7)D1(1) | 9.3(5w) | 8.2(7) | 9.3(7) | 9.3(7k) | 7.3(8)D1(1) | 9.3(7a) | 8.2(7a) | 9.3(8) | 8.4(4a) | 8.4(5) | 8.2(8) | 9.3(9) | 7.3(9)D1(1) | 8.4(6) | 9.3(10) | 8.2(9) | 10.3(1) | 8.4(7) | 10.3(2) | 8.4(6a) | 9.3(11) | 10.3(3) | 8.2(10) | 9.3(12) | 10.4(1) | 8.4(8) | 10.3(99w) | 10.3(3w) | 10.3(99x) | 10.3(3o) | 8.4(9) | 10.3(4) | 10.3(3p) | 10.3(4a) | 10.4(2) | 10.3(3q) | 9.3(13) | 8.2(11) | 10.3(5) | 10.4(3) | 10.3(3x) | 10.3(4g) | 10.5(1) | 8.4(10) | 10.3(3r) | 10.3(6) | 9.3(14) | 10.4(4) | 10.3(4h) | 10.5(2) | 8.4(11) | 10.3(7) | 10.4(5) | 10.5(3) | 9.3(15) | 10.4(4g) | 10.5(4) | 8.4(12) | 10.5(3t) | 10.3(8) | 10.4(6) | 10.5(3s) | 10.5(3e) | 10.5(3o) | 9.3(16) | 10.5(3p) | 10.4(7) | 10.5(5) | 9.3(17)

1 vendor · 1 product

References

1 links