CVE-2005-1020: Secure Shell (SSH) 2 in Cisco IOS 12.0 through 12.3 allows remote attackers to cause a denial of service (d...

Security readout for executives and security teams

This vulnerability can make affected Cisco IOS routers or switches reload when handling certain SSHv2 conditions. For executives, the business risk is service disruption, not data theft based on the provided sources. Exposure depends on whether old Cisco IOS 12.0 through 12.3 devices still run SSH management services. Most likely exposure is legacy Cisco IOS 12.0 through 12.3 infrastructure with SSHv2 enabled, especially where management access is reachable beyond tightly controlled administrative networks. Environments using TACACS+ authentication may match one described trigger condition. Treat as a legacy network availability risk. Prioritize if affected Cisco IOS devices are still operational, support critical routing/switching, or expose SSH management broadly. If those conditions are absent, urgency is lower but inventory cleanup remains important. Mitigation focus: Review Cisco advisory cisco-sa-20050406-ssh for affected releases and vendor remediation guidance.; Inventory Cisco IOS 12.0 through 12.3 devices with SSH enabled.; Prioritize remediation for management interfaces reachable from untrusted networks..

Prepared

Jun 29, 2026, 22:58 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.