Vulnerability Name:

CVE-2021-1622 (CCN-209913)

Assigned:2020-11-13
Published:2021-09-21
Updated:2021-11-23
Summary:A vulnerability in the Common Open Policy Service (COPS) of Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers could allow an unauthenticated, remote attacker to cause resource exhaustion, resulting in a denial of service (DoS) condition. This vulnerability is due to a deadlock condition in the code when processing COPS packets under certain conditions. An attacker could exploit this vulnerability by sending COPS packets with high burst rates to an affected device. A successful exploit could allow the attacker to cause the CPU to consume excessive resources, which prevents other control plane processes from obtaining resources and results in a DoS.
CVSS v3 Severity:8.6 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
7.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
8.6 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
7.5 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-667
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-1622

Source: XF
Type: UNKNOWN
cisco-cve20211622-dos(209913)

Source: CCN
Type: Cisco Security Advisory cisco-sa-cbr8-cops-Vc2ZsJSx
Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers Common Open Policy Service Denial of Service Vulnerability

Source: CISCO
Type: Patch, Vendor Advisory
20210922 Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers Common Open Policy Service Denial of Service Vulnerability

Vulnerable Configuration:Configuration 1:
  • cpe:/o:cisco:ios_xe:*:*:*:*:*:*:*:* (Version < 16.12.1z1)
  • OR cpe:/o:cisco:ios_xe:17.3.1x:*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:7600_router:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_901-12c-f-d:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_901-12c-ft-d:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_901-4c-f-d:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_901-4c-ft-d:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_901-6cz-f-a:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_901-6cz-f-d:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_901-6cz-fs-a:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_901-6cz-fs-d:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_901-6cz-ft-a:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_901-6cz-ft-d:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:cbr-8:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:cisco:ios_xe_software:*:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    cisco ios xe *
    cisco ios xe 17.3.1x
    cisco 7600 router -
    cisco asr 901-12c-f-d -
    cisco asr 901-12c-ft-d -
    cisco asr 901-4c-f-d -
    cisco asr 901-4c-ft-d -
    cisco asr 901-6cz-f-a -
    cisco asr 901-6cz-f-d -
    cisco asr 901-6cz-fs-a -
    cisco asr 901-6cz-fs-d -
    cisco asr 901-6cz-ft-a -
    cisco asr 901-6cz-ft-d -
    cisco cbr-8 -
    cisco ios xe software *