CVE-2019-1739 HIGH

CVE-2019-1739: Cisco IOS and IOS XE Software Network-Based Application Recognition Denial of Service Vulnerabilities

Vendor Cisco
Product Cisco IOS and Cisco IOS-XE Software
Weakness CWE-20 · Input validation
Published March 27, 2019
Last update September 16, 2024
View on NVD All CVEs

CVSS base score

8.6/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 27, 2019 CVE published
September 16, 2024 Record updated