7.4

CVE-2025-20241: cisco cisco nx-os software

CVSS: 7.4v3.1HighDeferred
Published 27-08-2025Last modified 27-08-2025
Open JSON

Vulnerability summary

CVE-2025-20241 is a high (CVSS 7.4) vulnerability in cisco cisco nx-os software. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 18.8% 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
0.28%
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. 27-08-2025
    PublishedVulnerability first disclosed.
  2. 27-08-2025
    Last modifiedVulnerability information updated.

Description

A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the IS-IS process to unexpectedly restart, which could cause an affected device to reload. This vulnerability is due to insufficient input validation when parsing an ingress IS-IS packet. An attacker could exploit this vulnerability by sending a crafted IS-IS packet to an affected device. A successful exploit could allow the attacker to cause the unexpected restart of the IS-IS process, which could cause the affected device to reload, resulting in a denial of service (DoS) condition. Note: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

19%

Versus all other CVEs

30-day change

+0.01 pp

From 0.27% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.28%

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 software9.2(3) | 7.0(3)I5(2) | 6.0(2)A8(7a) | 7.0(3)I4(5) | 7.0(3)I4(6) | 7.0(3)I4(3) | 9.2(2v) | 7.0(3)I4(7) | 7.0(3)I4(1) | 7.0(3)I4(8) | 7.0(3)I4(2) | 6.0(2)A8(11) | 9.2(1) | 9.2(2t) | 9.2(3y) | 7.0(3)I4(1t) | 7.0(3)I7(6z) | 9.3(2) | 7.0(3)F3(3) | 7.0(3)I7(3z) | 7.0(3)IM7(2) | 6.0(2)A8(11b) | 7.0(3)I7(5a) | 7.0(3)I6(1) | 7.0(3)I5(3b) | 9.2(4) | 6.0(2)A8(10) | 6.0(2)A8(2) | 7.0(3)IC4(4) | 7.0(3)F3(3c) | 7.0(3)F3(1) | 7.0(3)F3(5) | 7.0(3)I7(2) | 7.0(3)I5(3) | 7.0(3)I7(3) | 6.0(2)A8(6) | 7.0(3)I6(2) | 6.0(2)A8(5) | 9.3(1) | 6.0(2)A8(7) | 7.0(3)I7(6) | 6.0(2)A8(11a) | 7.0(3)I4(8z) | 7.0(3)I4(9) | 7.0(3)I7(4) | 7.0(3)I7(7) | 6.0(2)A8(9) | 6.0(2)A8(1) | 6.0(2)A8(10a) | 7.0(3)I5(1) | 9.3(1z) | 9.2(2) | 7.0(3)F3(4) | 7.0(3)I4(8b) | 6.0(2)A8(3) | 7.0(3)I4(6t) | 7.0(3)I5(3a) | 6.0(2)A8(8) | 7.0(3)I7(5) | 7.0(3)F3(3a) | 6.0(2)A8(4) | 7.0(3)I4(8a) | 7.0(3)F3(2) | 7.0(3)I4(4) | 7.0(3)I7(1) | 7.0(3)IA7(2) | 7.0(3)IA7(1) | 6.0(2)A8(7b) | 6.0(2)A8(4a) | 9.3(3) | 7.0(3)I7(8) | 9.3(4) | 9.3(5) | 7.0(3)I7(9) | 9.3(6) | 10.1(2) | 10.1(1) | 9.3(5w) | 9.3(7) | 9.3(7k) | 7.0(3)I7(9w) | 10.2(1) | 9.3(7a) | 9.3(8) | 7.0(3)I7(10) | 10.2(1q) | 10.2(2) | 9.3(9) | 10.1(2t) | 10.2(3) | 10.2(3t) | 9.3(10) | 10.2(2a) | 10.3(1) | 10.2(4) | 10.3(2) | 9.3(11) | 10.3(3) | 10.2(5) | 9.3(12) | 10.2(3v) | 10.4(1) | 10.3(99w) | 10.2(6) | 10.3(3w) | 10.3(99x) | 10.3(3o) | 10.3(4) | 10.3(3p) | 10.3(4a) | 10.4(2) | 10.3(3q) | 9.3(13) | 10.3(5) | 10.2(7) | 10.4(3) | 10.3(3x) | 10.3(4g) | 10.5(1) | 10.2(8) | 10.3(3r) | 10.3(6) | 9.3(14) | 10.4(4) | 10.3(4h) | 10.5(2) | 10.4(4g)

1 vendor · 1 product

References

1 links