Improper Interaction Between Multiple Correctly-Behaving Entities in Cisco IOS and Cisco IOS XE - CVE-2021-34699
Published: September 24, 2021
Vulnerability identifier: #VU56873
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-34699
CWE-ID: CWE-435
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an improper interaction between the web UI and the CLI parser. A remote authenticated attacker can request a particular CLI command to be run through the web UI and cause a denial of service condition on the target system.
Affected software
Cisco IOS
Cisco IOS XE
Cisco IOS XE
How to mitigate CVE-2021-34699
Install update from vendor's website.
Cisco IOS - addressed in versions 16.9.8, 16.12.6, 17.3.4, 17.6.1
Cisco IOS XE - addressed in versions 16.9.8, 16.12.6, 17.3.4, 17.6.1
Cisco IOS XE - addressed in versions 16.9.8, 16.12.6, 17.3.4, 17.6.1