CVE-2019-12655 Cisco IOS XE Software FTP Application Layer Gateway for NAT, NAT64, and ZBFW Denial of Service Vulnerability

High 8.6 Published 25 Sep 2019 Updated 19 Nov 2024

A remote unauthenticated attacker can cause a Cisco IOS XE device to reload by exploiting a buffer overflow in the FTP ALG functionality.

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-2019-12655?

CVE-2019-12655 is a high-severity memory corruption vulnerability in Cisco Ios, published on 25 Sep 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the FTP application layer gateway (ALG) functionality used by Network Address Translation (NAT), NAT IPv6 to IPv4 (NAT64), and the Zone-Based Policy Firewall (ZBFW) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a buffer overflow that occurs when an affected device inspects certain FTP traffic. An attacker could exploit this vulnerability by performing a specific FTP transfer through the device. A successful exploit could allow the attacker to cause the device to reload.

Weakness: CWE-120, CWE-20

Which versions are affected by CVE-2019-12655?

It affects 1 product.

Products include Cisco Ios.

How do I fix CVE-2019-12655?

No fix has been published for CVE-2019-12655 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2019-12655 being exploited?

There is no known exploitation of CVE-2019-12655 in the wild and no public exploit code.

All Cisco Ios vulnerabilities

Sources

Also known as GHSA-56j6-c5p2-5rq5.