What is CVE-2019-1951?

CVE-2019-1951 is a vulnerability in the packet filtering features of Cisco SD-WAN Solution that allows an unauthenticated, remote attacker to bypass L3 and L4 traffic filters.

What is the severity of CVE-2019-1951?

CVE-2019-1951 has a severity rating of medium with a CVSS score of 5.8.

How does CVE-2019-1951 affect Cisco SD-WAN Solution?

CVE-2019-1951 affects Cisco SD-WAN Solution by allowing an unauthenticated, remote attacker to bypass L3 and L4 traffic filters.

How can an attacker exploit CVE-2019-1951?

An attacker can exploit CVE-2019-1951 by crafting malicious traffic that bypasses the improper traffic filtering conditions on an affected device.

Is there a fix available for CVE-2019-1951?

Yes, Cisco has released a security advisory with mitigation details and software updates to address the vulnerability. Please refer to the official Cisco Security Advisory for more information.

Vulnerability/
CVE-2019-1951

medium

5.8

CWE

7/8/2019

4/8/2024

CVE-2019-1951: Cisco SD-WAN Solution Packet Filtering Bypass Vulnerability

First published: Wed Aug 07 2019(Updated: )

A vulnerability in the packet filtering features of Cisco SD-WAN Solution could allow an unauthenticated, remote attacker to bypass L3 and L4 traffic filters. The vulnerability is due to improper traffic filtering conditions on an affected device. An attacker could exploit this vulnerability by crafting a malicious TCP packet with specific characteristics and sending it to a target device. A successful exploit could allow the attacker to bypass the L3 and L4 traffic filters and inject an arbitrary packet in the network.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco Sd-wan Firmware	<=19.1.0

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-sd-wan-bypass

Frequently Asked Questions

What is CVE-2019-1951?
CVE-2019-1951 is a vulnerability in the packet filtering features of Cisco SD-WAN Solution that allows an unauthenticated, remote attacker to bypass L3 and L4 traffic filters.
What is the severity of CVE-2019-1951?
CVE-2019-1951 has a severity rating of medium with a CVSS score of 5.8.
How does CVE-2019-1951 affect Cisco SD-WAN Solution?
CVE-2019-1951 affects Cisco SD-WAN Solution by allowing an unauthenticated, remote attacker to bypass L3 and L4 traffic filters.
How can an attacker exploit CVE-2019-1951?
An attacker can exploit CVE-2019-1951 by crafting malicious traffic that bypasses the improper traffic filtering conditions on an affected device.
Is there a fix available for CVE-2019-1951?
Yes, Cisco has released a security advisory with mitigation details and software updates to address the vulnerability. Please refer to the official Cisco Security Advisory for more information.

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