Although disclosed in 2022, this vulnerability remains relevant for organizations running older code trains. The flaw in the SSH implementation of Cisco IOS and IOS XE Software allows an authenticated, remote attacker to cause an affected device to reload by continuously connecting and sending specific SSH requests.
The most critical vulnerability risk remains the presence of static, hardcoded, or poorly rotated credentials left behind during deployment phases. Certain specialized orchestration tools or developer backdoors across networking lines can leave static accounts active on the device, allowing root or level-15 access directly through an open Port 22 interface. Comparative Matrix: SSH Architectural Security Evolution
for a specific version of Cisco IOS you are currently running? ssh20cisco125 vulnerability exclusive
! Force SSH Version 2 ip ssh version 2 ! Enforce strong encryption algorithms and HMACs ip ssh server algorithm encryption aes256-gcm aes128-gcm ip ssh server algorithm authentication public-key Use code with caution. 4. Establish Strict Session Timeouts
Securing Cisco appliances against SSH-based exploits requires an aggressive, multi-layered hardening strategy. Follow these direct steps to secure your infrastructure: 1. Identify and Enforce the Correct Software Version Force SSH Version 2 ip ssh version 2
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common vulnerabilities and exposures (CVE) - Glossary | CSRC common vulnerabilities and exposures (CVE) NIST Computer Security Resource Center (.gov) Although disclosed in 2022
This vulnerability affects the SSH connection handling in Cisco Integrated Management Controller (IMC) for UCS B-Series, C-Series, S-Series, and X-Series Servers. It allows an authenticated, remote attacker to access internal services with elevated privileges.
In this vulnerability, however, the authentication mechanism fails to properly validate certain crafted inputs. An attacker can and still be granted access. By submitting specially crafted input during the SSH authentication phase, the attacker can trick the ASA software into believing the authentication was successful, even though the private key was never used.