Permissions, Privileges, and Access Controls in Cisco Systems, Inc products - CVE-2021-34787
Published: October 28, 2021
Vulnerability identifier: #VU57767
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-34787
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists in the identity-based firewall (IDFW) rule processing feature. A remote attacker can send a specially crafted network request to bypass access control list (ACL) rules on the device, bypass security protections, and send network traffic to unauthorized hosts.
Affected software
ASA 5500-X Series Firewalls
Cisco Firewall Threat Defense (FTD)
Cisco Adaptive Security Appliance (ASA)
Cisco Firewall Threat Defense (FTD)
Cisco Adaptive Security Appliance (ASA)
How to mitigate CVE-2021-34787
Install updates from vendor's website.
Cisco Firewall Threat Defense (FTD) - addressed in versions 6.4.0.13, 6.6.5, 6.7.0.3, 7.0.1
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.8.4.40, 9.12.4.25, 9.14.3.1, 9.15.1.17, 9.16.1.28
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.8.4.40, 9.12.4.25, 9.14.3.1, 9.15.1.17, 9.16.1.28