CVE-2019-1747 Cisco IOS and IOS XE Software Short Message Service Denial of Service Vulnerability

High 8.6 Published 27 Mar 2019 Updated 19 Nov 2024

Remote attackers can crash the WWAN cellular interface on Cisco IOS devices by sending malicious SMS messages, causing a denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-1747?

CVE-2019-1747 is a high-severity denial of service vulnerability in Cisco Ios, published on 27 Mar 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the implementation of the Short Message Service (SMS) handling functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition on an affected device. The vulnerability is due to improper processing of SMS protocol data units (PDUs) that are encoded with a special character set. An attacker could exploit this vulnerability by sending a malicious SMS message to an affected device. A successful exploit could allow the attacker to cause the wireless WAN (WWAN) cellular interface module on an affected device to crash, resulting in a DoS condition that would require manual intervention to restore normal operating conditions.

Weakness: CWE-20

Which versions are affected by CVE-2019-1747?

It affects 2 products.

Products include Cisco Ios, Cisco Ios Xe.

How do I fix CVE-2019-1747?

No fix has been published for CVE-2019-1747 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-1747 being exploited?

There is no known exploitation of CVE-2019-1747 in the wild and no public exploit code.

All Cisco Ios vulnerabilities

Sources

Also known as GHSA-7j37-qcxx-cjxp.