8.6
HIGH
CVE-2021-1622
"Cisco cBR-8 Converged Broadband Routers COPS Deadlock Denial of Service"
Description

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.

INFO

Published Date :

Sept. 23, 2021, 3:15 a.m.

Last Modified :

Nov. 21, 2024, 5:44 a.m.

Remotely Exploitable :

Yes !

Impact Score :

4.0

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-1622 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Cisco ios_xe
2 Cisco 7600_router
3 Cisco asr_901-12c-f-d
4 Cisco asr_901-12c-ft-d
5 Cisco asr_901-4c-f-d
6 Cisco asr_901-4c-ft-d
7 Cisco asr_901-6cz-f-a
8 Cisco asr_901-6cz-f-d
9 Cisco asr_901-6cz-fs-a
10 Cisco asr_901-6cz-fs-d
11 Cisco asr_901-6cz-ft-a
12 Cisco asr_901-6cz-ft-d
13 Cisco cbr-8
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-1622.

URL Resource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cbr8-cops-Vc2ZsJSx Patch Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cbr8-cops-Vc2ZsJSx Patch Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-1622 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-1622 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cbr8-cops-Vc2ZsJSx
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Removed CVSS V3 Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
    Added CVSS V3.1 Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
  • Reanalysis by [email protected]

    Nov. 23, 2021

    Action Type Old Value New Value
    Changed CPE Configuration AND OR *cpe:2.3:a:cisco:ios_xe:*:*:*:*:*:*:*:* versions up to (excluding) 16.12.1z1 *cpe:2.3:a:cisco:ios_xe:17.3.1x:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:7600_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-12c-f-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-12c-ft-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-4c-f-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-4c-ft-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-f-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-f-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-fs-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-fs-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-ft-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-ft-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:cbr-8:-:*:*:*:*:*:*:* AND OR *cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:* versions up to (excluding) 16.12.1z1 *cpe:2.3:o:cisco:ios_xe:17.3.1x:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:7600_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-12c-f-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-12c-ft-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-4c-f-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-4c-ft-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-f-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-f-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-fs-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-fs-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-ft-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-ft-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:cbr-8:-:*:*:*:*:*:*:*
  • Initial Analysis by [email protected]

    Sep. 30, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
    Changed Reference Type https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cbr8-cops-Vc2ZsJSx No Types Assigned https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cbr8-cops-Vc2ZsJSx Patch, Vendor Advisory
    Added CWE NIST CWE-667
    Added CPE Configuration AND OR *cpe:2.3:a:cisco:ios_xe:*:*:*:*:*:*:*:* versions up to (excluding) 16.12.1z1 *cpe:2.3:a:cisco:ios_xe:17.3.1x:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:7600_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-12c-f-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-12c-ft-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-4c-f-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-4c-ft-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-f-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-f-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-fs-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-fs-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-ft-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_901-6cz-ft-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:cbr-8:-:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-1622 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-1622 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.16 }} 0.02%

score

0.52604

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
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Scope
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