CVE-2019-1740

Cisco IOS and IOS XE Software Network-Based Application Recognition Denial of Service Vulnerabilities

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 are 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.

Category

8.6
CVSS
Severity: High
CVSS 3.1 •
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.78% Top 30%
Vendor Advisory cisco.com
Affected: Cisco Cisco IOS and Cisco IOS-XE Software
Published at:
Updated at:

References

Link Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-nbar patch vendor advisory
http://www.securityfocus.com/bid/107597 third party advisory vdb entry

Frequently Asked Questions

What is the severity of CVE-2019-1740?
CVE-2019-1740 has been scored as a high severity vulnerability.
How to fix CVE-2019-1740?
To fix CVE-2019-1740, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-1740 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2019-1740 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-1740?
CVE-2019-1740 affects Cisco Cisco IOS and Cisco IOS-XE Software.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.