CVE-2021-1592

Cisco UCS Manager Software SSH Sessions Denial of Service Vulnerability

Severity Score

4.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Una vulnerabilidad en la forma en que el software Cisco UCS Manager maneja las sesiones SSH podría permitir a un atacante remoto autenticado causar una condición de denegación de servicio (DoS) en un dispositivo afectado. Esta vulnerabilidad es debido a un manejo inapropiado de los recursos para las sesiones SSH establecidas. Un atacante podría explotar esta vulnerabilidad al abrir un número significativo de sesiones SSH en un dispositivo afectado. Una explotación con éxito podría permitir al atacante causar un bloqueo y reinicio de los procesos internos del software Cisco UCS Manager y una pérdida temporal de acceso a la CLI y la UI web de Cisco UCS Manager. Nota: El atacante debe tener credenciales de usuario válidas para autenticarse en el dispositivo afectado.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-11-13 CVE Reserved
2021-08-25 CVE Published
2023-03-18 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-664: Improper Control of a Resource Through its Lifetime
CWE-770: Allocation of Resources Without Limits or Throttling

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-ssh-dos-MgvmyrQy	2023-11-07

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"	Unified Computing System Search vendor "Cisco" for product "Unified Computing System"	>= 4.0 < 4.0\(4m\) Search vendor "Cisco" for product "Unified Computing System" and version " >= 4.0 < 4.0\(4m\)"	-	Affected	in	Cisco Search vendor "Cisco"	Unified Computing System 64108 Search vendor "Cisco" for product "Unified Computing System 64108"	-	-	Safe
Cisco Search vendor "Cisco"	Unified Computing System Search vendor "Cisco" for product "Unified Computing System"	>= 4.0 < 4.0\(4m\) Search vendor "Cisco" for product "Unified Computing System" and version " >= 4.0 < 4.0\(4m\)"	-	Affected	in	Cisco Search vendor "Cisco"	Unified Computing System 6454 Search vendor "Cisco" for product "Unified Computing System 6454"	-	-	Safe
Cisco Search vendor "Cisco"	Unified Computing System Search vendor "Cisco" for product "Unified Computing System"	>= 4.1 < 4.1\(3e\) Search vendor "Cisco" for product "Unified Computing System" and version " >= 4.1 < 4.1\(3e\)"	-	Affected	in	Cisco Search vendor "Cisco"	Unified Computing System 64108 Search vendor "Cisco" for product "Unified Computing System 64108"	-	-	Safe
Cisco Search vendor "Cisco"	Unified Computing System Search vendor "Cisco" for product "Unified Computing System"	>= 4.1 < 4.1\(3e\) Search vendor "Cisco" for product "Unified Computing System" and version " >= 4.1 < 4.1\(3e\)"	-	Affected	in	Cisco Search vendor "Cisco"	Unified Computing System 6454 Search vendor "Cisco" for product "Unified Computing System 6454"	-	-	Safe