Medium (5.9) in Cisco IOS. In CISA KEV since 2023-05-19. EPSS 4.8% chance of exploitation in the next 30 days.
Cisco IOS 12.2(15) and earlier allows remote attackers to cause a denial of service (refused VTY (virtual terminal) connections), via a crafted TCP connection to the Telnet or reverse Telnet port.
Severity
CVSS 3.1
5.9 medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
4.8% chance of exploitation in the next 30 days; higher than 92% of CVEs (scores of 2026-10-31)