Medium severity6.0NVD Advisory· Published Sep 9, 2021· Updated Jun 17, 2026

CVE-2021-34709

Description

Multiple vulnerabilities in image verification checks of Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for Cisco 8000 Series Routers could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. For more information about these vulnerabilities, see the Details section of this advisory.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Cisco Systems, Inc./iOS Xr
cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
Range: <7.3.2
Cisco Systems, Inc./IOS XR NCS540L software imagesllm-create
Cisco Systems, Inc./IOS XR Software for Cisco 8000 Series Routersllm-fuzzy
Cisco Systems, Inc./Network Convergence System (NCS) 5500 Series Routersllm-fuzzy
Cisco Systems, Inc./iOS Xr Softwarecpe-rescue
Range: n/a

Patches

Vulnerability mechanics

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-QN9mCzwnnvdVendor Advisory

News mentions

No linked articles in our index yet.

cvss	0.390
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000