8.6

CVE-2025-20146: cisco cisco ios xr software Improper Input Validation

CVSS: 8.6v3.1HighAnalyzed
Published 12-03-2025Last modified 21-03-2025
Open JSON

Vulnerability summary

CVE-2025-20146 is a high (CVSS 8.6) Improper Input Validation vulnerability in cisco cisco ios xr software. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 44.2% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.6/10
010
High · v3.1 (CVE.org)
EPSS score
0.54%
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. 12-03-2025
    PublishedVulnerability first disclosed.
  2. 21-03-2025
    Last modifiedVulnerability information updated.

Description

A vulnerability in the Layer 3 multicast feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, ASR 9902 Compact High-Performance Routers, and ASR 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause a line card to reset, resulting in a denial of service (DoS) condition. This vulnerability is due to the incorrect handling of malformed IPv4 multicast packets that are received on line cards where the interface has either an IPv4 access control list (ACL) or a QoS policy applied. An attacker could exploit this vulnerability by sending crafted IPv4 multicast packets through an affected device. A successful exploit could allow the attacker to cause line card exceptions or a hard reset. Traffic over that line card would be lost while the line card reloads.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.54%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

+0.01 pp

From 0.53% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.54%

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 ios xr software7.11.1 | 7.9.21 | 7.10.2 | 24.1.1 | 7.11.2 | 24.2.1 | 24.1.2 | 24.3.1 | 24.2.2 | 7.11.21 | 24.3.2
  • ios_xr7.9.21 | 7.10.2 | 7.11.1 | 7.11.2 | 7.11.21 | 24.1.1 | 24.1.2 | 24.2.1 | 24.2.2 | 24.3.1 | 24.3.2

1 vendor · 2 products

References

2 links