// For flags

CVE-2020-27121

Cisco Unified Communications Manager IM and Presence Service Denial of Service Vulnerability

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

A vulnerability in Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P) Software could allow an authenticated, remote attacker to cause the Cisco XCP Authentication Service on an affected device to restart, resulting in a denial of service (DoS) condition. The vulnerability is due to improper handling of login requests. An attacker could exploit this vulnerability by sending a crafted client login request to an affected device. A successful exploit could allow the attacker to cause a process to crash, resulting in a DoS condition for new login attempts. Users who are authenticated at the time of the attack would not be affected. There are workarounds that address this vulnerability.

Una vulnerabilidad en Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P) Software podría permitir a un atacante remoto autenticado causar que Cisco XCP Authentication Service en un dispositivo afectado se reinicie, resultando en una condición de denegación de servicio (DoS). La vulnerabilidad es debido al manejo inapropiado de las peticiones de inicio de sesión. Un atacante podría explotar esta vulnerabilidad mediante el envío de una petición de inicio de sesión de cliente diseñada hacia un dispositivo afectado. Una explotación con éxito podría permitir al atacante causar que un proceso se bloquee, resultando en una condición de DoS para nuevos intentos de inicio de sesión. Los usuarios que estén autenticados en el momento del ataque no serían afectados. Existen soluciones que abordan esta vulnerabilidad

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
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:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2020-10-13 CVE Reserved
  • 2020-11-06 CVE Published
  • 2023-03-07 EPSS Updated
  • 2024-11-13 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-248: Uncaught Exception
  • CWE-755: Improper Handling of Exceptional Conditions
CAPEC
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 Communications Manager Im And Presence Service
Search vendor "Cisco" for product "Unified Communications Manager Im And Presence Service"
 12.5\(1\)
Search vendor "Cisco" for product "Unified Communications Manager Im And Presence Service" and version "12.5\(1\)"
-
Affected