PT-2021-4886 · Cisco · Cisco Asa+1

Published 2021-10-27 · Updated 2023-08-16 · CVE-2021-34787

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Cisco Adaptive Security Appliance (ASA) Software (affected versions not specified) Cisco Firepower Threat Defense (FTD) Software (affected versions not specified)

Description A vulnerability in the identity-based firewall (IDFW) rule processing feature could allow an unauthenticated, remote attacker to bypass security protections. This issue is due to improper handling of network requests by affected devices configured to use object group search. An attacker could exploit this vulnerability by sending a specially crafted network request to an affected device. A successful exploit could allow the attacker to bypass access control list (ACL) rules on the device, bypass security protections, and send network traffic to unauthorized hosts.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Handling of Exceptional Conditions

Weakness Enumeration

CWE-183

CWE-264

CWE-755

Related Identifiers

BDU:2021-05621

CVE-2021-34787

Affected Products

Cisco Asa

Cisco Ftd

References · 9

• https://osv.dev/vulnerability/CVE-2021-34787 · Vendor Advisory
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-ejjOgQEY · Vendor Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-ejjOgQEY · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-34787 · Security Note
• https://bdu.fstec.ru/vul/2021-05621 · Security Note
• https://t.me/cvenotify/22636 · Telegram Post
• https://t.me/cvenotify/22522 · Telegram Post
• https://t.me/cibsecurity/31307 · Telegram Post
• https://cybersecurity-help.cz/vdb/SB2021102809 · Note