Medium severity6.7NVD Advisory· Published Feb 4, 2021· Updated Jun 17, 2026

CVE-2021-1244

Description

Multiple vulnerabilities in Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for the Cisco 8000 Series Routers could allow an authenticated, local attacker to execute unsigned code during the boot process on an affected device. 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: <7.0.12
Cisco Systems, Inc./iOS Xr Softwarellm-fuzzy2 versions
(expand)+ 1 more
- (no CPE)
- (no CPE)range: n/a
Cisco Systems, Inc./Network Convergence System (NCS) 5500 Series Routersllm-fuzzy

Patches

Vulnerability mechanics

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ioxr-l-zNhcGCBtnvdVendor Advisory

News mentions

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