VULNERABILITY INTELLIGENCE

CVE-2019-1739

CVSS score7.5 HIGH

EPSS probability2.52%

CISA KEVNot currently listed

Published2019-03-28

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

A vulnerability in the Network-Based Application Recognition (NBAR) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. This vulnerability is due to a parsing issue on DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through routers that are running an affected version and have NBAR enabled. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition.

Weakness classification

CWE-20: Improper Input Validation

Primary references

psirt@cisco.com — Broken Link, Third Party Advisory, VDB Entry
psirt@cisco.com — Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Broken Link, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108 — Patch, Vendor Advisory