7.4

CVE-2025-20191: cisco cisco nx-os software

CVSS: 7.4v3.1HighDeferred
Published 07-05-2025Last modified 07-05-2025
Open JSON

Vulnerability summary

CVE-2025-20191 is a high (CVSS 7.4) vulnerability in cisco cisco nx-os software. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 14.7% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.25%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 07-05-2025
    PublishedVulnerability first disclosed.
  2. 07-05-2025
    Last modifiedVulnerability information updated.

Description

A vulnerability in the Switch Integrated Security Features (SISF) of Cisco IOS Software, Cisco IOS XE Software, Cisco NX-OS Software, and Cisco Wireless LAN Controller (WLC) AireOS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to the incorrect handling of DHCPv6 packets. An attacker could exploit this vulnerability by sending a crafted DHCPv6 packet to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

+0.01 pp

From 0.24% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.25%

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

Cisco2 products
  • 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) | 7.0(3)I7(6z) | 9.3(2) | 7.0(3)I7(3z) | 7.0(3)IM7(2) | 7.0(3)I7(5a) | 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) | 7.0(3)I7(2) | 7.0(3)I7(3) | 8.4(1) | 7.3(0)DX(1) | 7.3(2)D1(1) | 9.3(1) | 7.0(3)I7(6) | 7.3(2)D1(2) | 8.2(4) | 7.0(3)I7(4) | 7.0(3)I7(7) | 9.3(1z) | 9.2(2) | 8.1(2a) | 7.3(2)D1(3) | 7.0(3)I7(5) | 7.0(3)I7(1) | 7.0(3)IA7(2) | 7.0(3)IA7(1) | 8.3(1) | 7.3(1)D1(1) | 7.3(0)D1(1) | 9.3(3) | 7.3(2)D1(1d) | 7.0(3)I7(8) | 9.3(4) | 7.3(6)D1(1) | 8.2(6) | 9.3(5) | 7.0(3)I7(9) | 9.3(6) | 10.1(2) | 10.1(1) | 8.4(4) | 7.3(7)D1(1) | 9.3(5w) | 8.2(7) | 9.3(7) | 9.3(7k) | 7.0(3)I7(9w) | 10.2(1) | 7.3(8)D1(1) | 9.3(7a) | 8.2(7a) | 9.3(8) | 8.4(4a) | 8.4(5) | 7.0(3)I7(10) | 8.2(8) | 10.2(1q) | 10.2(2) | 9.3(9) | 10.1(2t) | 7.3(9)D1(1) | 10.2(3) | 8.4(6) | 10.2(3t) | 9.3(10) | 10.2(2a) | 8.2(9) | 10.3(1) | 10.2(4) | 8.4(7) | 10.3(2) | 8.4(6a) | 9.3(11) | 10.3(3) | 10.2(5) | 8.2(10) | 9.3(12) | 10.2(3v) | 10.4(1) | 8.4(8) | 10.3(99w) | 10.2(6) | 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) | 10.2(7) | 10.4(3) | 10.3(3x) | 10.3(4g) | 10.2(8) | 10.3(3r) | 9.3(14) | 10.3(4h)
  • cisco wireless lan controller (wlc)8.10.112.0 | 8.8.120.0 | 8.3.143.0 | 8.3.111.0 | 8.2.164.0 | 8.5.109.0 | 8.3.132.0 | 8.5.105.0 | 8.2.170.0 | 8.2.160.0 | 8.8.100.0 | 8.9.111.0 | 8.7.102.0 | 8.3.102.0 | 8.3.133.0 | 8.3.131.0 | 8.5.100.0 | 8.5.131.0 | 8.3.122.0 | 8.5.101.0 | 8.3.112.0 | 8.5.120.0 | 8.2.141.0 | 8.3.141.0 | 8.3.121.0 | 8.2.151.0 | 8.3.130.0 | 8.5.102.0 | 8.2.161.0 | 8.5.151.0 | 8.2.100.0 | 8.5.135.0 | 8.3.135.0 | 8.5.140.0 | 8.7.106.0 | 8.9.100.0 | 8.8.111.0 | 8.2.110.0 | 8.5.110.0 | 8.2.130.0 | 8.5.141.105 | 8.2.121.0 | 8.8.125.0 | 8.3.150.0 | 8.2.111.0 | 8.10.105.0 | 8.5.108.0 | 8.3.108.0 | 8.2.166.0 | 8.5.103.0 | 8.3.140.0 | 8.6.101.0 | 8.4.100.0 | 8.5.160.0 | 8.5.161.0 | 8.8.130.0 | 8.10.120.0 | 8.10.121.0 | 8.10.113.0 | 8.10.122.0 | 8.10.130.0 | 8.10.141.0 | 8.10.142.0 | 8.5.171.0 | 8.10.150.0 | 8.10.151.0 | 8.10.162.0 | 8.5.182.0 | 8.10.171.0 | 8.10.180.0 | 8.10.181.0 | 8.10.182.0 | 8.10.170.0 | 8.10.183.0 | 8.5.182.7 | 8.5.182.105 | 8.5.182.106 | 8.10.185.0 | 8.5.182.107 | 8.5.182.11 | 8.5.182.108 | 8.10.190.0 | 8.10.195.0 | 8.5.182.12

1 vendor · 2 products

References

1 links