Improper Verification of Cryptographic Signature in Cisco 8000 Series Routers and Cisco Network Convergence System 540 Series Routers - CVE-2021-34709
Published: September 9, 2021
Vulnerability identifier: #VU56425
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-34709
CWE-ID: CWE-347
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco 8000 Series Routers
Cisco Network Convergence System 540 Series Routers
Cisco 8000 Series Routers
Cisco Network Convergence System 540 Series Routers
Detailed vulnerability description
The vulnerability allows a local administrator to execute arbitrary code on the system.
The vulnerability exists in the Cisco IOS XR due to a race condition that occurs when the install request is being processed. A local administrator can modify an ISO image and execute arbitrary code on the affected device.
How to mitigate CVE-2021-34709
Install updates from vendor's website.