Vulnerability · Published Aug 25, 2021 · Assigned by cisco

CVE-2021-1592Cisco UCS Manager Software SSH Sessions Denial of Service Vulnerability

Medium 4.3

In plain English

A medium-severity security flaw in Cisco Unified Computing System (Managed) from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)1.0%top 36.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
Cisco	Cisco Unified Computing System (Managed)	n/a

Weakness: CWE-664 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

References

20210825 Cisco UCS Manager Software SSH Sessions Denial of Service Vulnerability vendor-advisory, x_refsource_CISCO