CVE-2021-1592 Cisco UCS Manager Software SSH Sessions Denial of Service Vulnerability
Authenticated attackers can cause a denial of service by opening excessive SSH sessions, crashing Cisco UCS Manager processes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-1592?
CVE-2021-1592 is a medium-severity denial of service vulnerability in Cisco Unified Computing System, published on 25 Aug 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability in the way Cisco UCS Manager software handles SSH sessions could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper resource management for established SSH sessions. An attacker could exploit this vulnerability by opening a significant number of SSH sessions on an affected device. A successful exploit could allow the attacker to cause a crash and restart of internal Cisco UCS Manager software processes and a temporary loss of access to the Cisco UCS Manager CLI and web UI. Note: The attacker must have valid user credentials to authenticate to the affected device.
Which versions are affected by CVE-2021-1592?
It affects 1 product.
Products include Cisco Unified Computing System.
How do I fix CVE-2021-1592?
No fix has been published for CVE-2021-1592 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-1592 being exploited?
There is no known exploitation of CVE-2021-1592 in the wild and no public exploit code.
Other vulnerabilities in Cisco Unified Computing System
- CVE-2026-20200 Cisco Integrated Management Controller Argument Injection and Remote Code Execution Vulnerability
- CVE-2026-20094 Cisco Integrated Management Controller Command Injection Vulnerability
- CVE-2018-0430 Cisco Integrated Management Controller Command Injection Vulnerability
- CVE-2018-0431 Cisco Integrated Management Controller Command Injection Vulnerability
- CVE-2012-4078 Auth bypass in n/a
Sources
Also known as GHSA-g536-3jmm-mp33.