CVE-2021-1592: Cisco UCS Manager Software SSH Sessions Denial of Service Vulnerability
First published: Wed Aug 25 2021(Updated: )
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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Unified Computing System | >=4.0<4.0\(4m\) | |
| Cisco Unified Computing System | >=4.1<4.1\(3e\) | |
| Cisco Unified Computing System 64108 | ||
| Cisco Unified Computing System 6454 |
Remedy
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-ssh-dos-MgvmyrQy
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Reference Links
Frequently Asked Questions
What is the vulnerability ID of this Cisco UCS Manager vulnerability?
The vulnerability ID is CVE-2021-1592.
What is the severity rating of CVE-2021-1592?
The severity rating of CVE-2021-1592 is medium (4.3).
How does this vulnerability impact Cisco UCS Manager software?
This vulnerability could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
What is the root cause of this vulnerability?
The vulnerability is due to improper resource management for established SSH sessions.
Where can I find more information about CVE-2021-1592?
You can find more information about CVE-2021-1592 in the Cisco Security Advisory: [https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-ssh-dos-MgvmyrQy](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-ssh-dos-MgvmyrQy).
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- canonical/cisco unified computing system 64108
- canonical/cisco unified computing system 6454