How severe is CVE-2025-20146?

CVE-2025-20146 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-20146 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-20146?

CVE-2025-20146 primarily affects Cisco Ios Xr. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-20146?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-20146 have an EU (EUVD) identifier?

Yes. CVE-2025-20146 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-7292.

When was CVE-2025-20146 published?

CVE-2025-20146 was published on 2025-03-12 and last updated on 2026-06-17.

CVE-2025-20146

CVE-2025-20146 is a high-severity vulnerability in Cisco Ios Xr with a CVSS 3.x base score of 8.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 8.6)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-7292
Weakness: CWE-20
Affected product: Cisco Ios Xr
Published: 2025-03-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-20146?: 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.
How severe is CVE-2025-20146?: CVE-2025-20146 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-20146 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-20146?: CVE-2025-20146 primarily affects Cisco Ios Xr. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-20146?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-20146 have an EU (EUVD) identifier?: Yes. CVE-2025-20146 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-7292.
When was CVE-2025-20146 published?: CVE-2025-20146 was published on 2025-03-12 and last updated on 2026-06-17.

References

Affected products (11)

cpe:2.3:o:cisco:ios_xr:7.9.21:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.10.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.11.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.11.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.11.21:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.1.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.1.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.2.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.3.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.3.2:*:*:*:*:*:*:*

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