THREAT OPS › Threat News › [NVD] CVE-2025-20311 (HIGH 7.4) — A vulnerability in the handling of certain Ethernet frames in Cisco IOS XE Software for Catalyst 9000 Series Switches could allow an unauthenticated, adjacent attacker to cause an egress port to become blocked and drop all outbound traffic.
This vulnerability is due to imprope
[NVD] CVE-2025-20311 (HIGH 7.4) — A vulnerability in the handling of certain Ethernet frames in Cisco IOS XE Software for Catalyst 9000 Series Switches could allow an unauthenticated, adjacent attacker to cause an egress port to become blocked and drop all outbound traffic. This vulnerability is due to imprope
CVE-2025-20311 CVSS: 7.4 HIGH Published: 2025-09-24T18:15:34.757
A vulnerability in the handling of certain Ethernet frames in Cisco IOS XE Software for Catalyst 9000 Series Switches could allow an unauthenticated, adjacent attacker to cause an egress port to become blocked and drop all outbound traffic. This vulnerability is due to improper handling of crafted Ethernet frames. An attacker cou
Indicators of compromise
- CVE-2025-20311cve
Original source: https://nvd.nist.gov/vuln/detail/CVE-2025-20311