5.8
MEDIUM
CVE-2021-34696
Cisco ASR 900/920 Series Aggregation Services Routers ACL Bypassremote Vulnerability
Description

A vulnerability in the access control list (ACL) programming of Cisco ASR 900 and ASR 920 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to incorrect programming of hardware when an ACL is configured using a method other than the configuration CLI. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass an ACL on the affected device.

INFO

Published Date :

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

Last Modified :

Nov. 7, 2023, 3:36 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

1.4

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-34696 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
: Total Affected Vendor : 1 | Products : 1
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-2021-34696.

URL Resource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr900acl-UeEyCxkv 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-2021-34696 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-34696 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 [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:L/A:N
    Added CVSS V3.1 Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
  • Initial Analysis by [email protected]

    Oct. 05, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:P/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
    Changed Reference Type https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr900acl-UeEyCxkv No Types Assigned https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr900acl-UeEyCxkv Vendor Advisory
    Added CWE NIST NVD-CWE-Other
    Added CPE Configuration AND OR *cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:* versions up to (including) 17.3.2 OR cpe:2.3:h:cisco:asr_902:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_903:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_907:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-10sz-pd:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-10sz-pd_r:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-12cz-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-12cz-a_r:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-12cz-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-12cz-d_r:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-12sz-im:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-12sz-im_r:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-24sz-im:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-24sz-im_r:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-24sz-m:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-24sz-m_r:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-24tz-m:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-24tz-m_r:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-4sz-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-4sz-a_r:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-4sz-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920-4sz-d_r:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_920u-12sz-im:-:*:*:*:*:*:*:*
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-2021-34696 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-2021-34696 weaknesses.

CAPEC-19: Embedding Scripts within Scripts Embedding Scripts within Scripts CAPEC-441: Malicious Logic Insertion Malicious Logic Insertion CAPEC-478: Modification of Windows Service Configuration Modification of Windows Service Configuration CAPEC-479: Malicious Root Certificate Malicious Root Certificate CAPEC-502: Intent Spoof Intent Spoof CAPEC-503: WebView Exposure WebView Exposure CAPEC-536: Data Injected During Configuration Data Injected During Configuration CAPEC-546: Incomplete Data Deletion in a Multi-Tenant Environment Incomplete Data Deletion in a Multi-Tenant Environment CAPEC-550: Install New Service Install New Service CAPEC-551: Modify Existing Service Modify Existing Service CAPEC-552: Install Rootkit Install Rootkit CAPEC-556: Replace File Extension Handlers Replace File Extension Handlers CAPEC-558: Replace Trusted Executable Replace Trusted Executable CAPEC-562: Modify Shared File Modify Shared File CAPEC-563: Add Malicious File to Shared Webroot Add Malicious File to Shared Webroot CAPEC-564: Run Software at Logon Run Software at Logon CAPEC-578: Disable Security Software Disable Security Software
Exploit Prediction

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

0.13 }} 0.02%

score

0.47801

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
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