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Medium severity6.5NVD Advisory· Published Jan 26, 2020· Updated Jun 17, 2026

CVE-2019-16027

CVE-2019-16027

Description

A vulnerability in the implementation of the Intermediate System–to–Intermediate System (IS–IS) routing protocol functionality in Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the IS–IS process. The vulnerability is due to improper handling of a Simple Network Management Protocol (SNMP) request for specific Object Identifiers (OIDs) by the IS–IS process. An attacker could exploit this vulnerability by sending a crafted SNMP request to the affected device. A successful exploit could allow the attacker to cause a DoS condition in the IS–IS process.

AI Insight

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

Affected products

19
  • Cisco Systems, Inc./iOS Xr17 versions
    cpe:2.3:o:cisco:ios_xr:4.3.2:*:*:*:*:*:*:*+ 16 more
    • cpe:2.3:o:cisco:ios_xr:4.3.2:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:5.2.5:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.1.2:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.1.3:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.1.4:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.2.25:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.2.2:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.2.3:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.3.15:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.3.2:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.3.3:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.4.2:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.5.2:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.6.1:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.6.25:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:*:*
  • Cisco Systems, Inc./iOS Xr Softwarellm-fuzzy2 versions
    (expand)+ 1 more
    • (no CPE)
    • (no CPE)range: unspecified

Patches

Vulnerability mechanics

References

1

News mentions

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