CVE-2019-12656 Cisco IOx Application Environment Denial of Service Vulnerability
Unauthenticated remote attackers can cause a denial of service in Cisco IOx web servers by sending crafted TLS packets.
- 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-2019-12656?
CVE-2019-12656 is a high-severity denial of service 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 IOx application environment of multiple Cisco platforms could allow an unauthenticated, remote attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a denial of service (DoS) condition. The vulnerability is due to a Transport Layer Security (TLS) implementation issue. An attacker could exploit this vulnerability by sending crafted TLS packets to the IOx web server on an affected device. A successful exploit could allow the attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a DoS condition.
Weakness: CWE-20
Which versions are affected by CVE-2019-12656?
It affects 6 products.
Products include Cisco Cgr 1000 Firmware, Cisco Ic3000 Firmware, Cisco Ie 4000 Firmware, Cisco Industrial Ethernet 2000 Series Firmware, Cisco Ios, Cisco Ir510 Wpan Firmware.
How do I fix CVE-2019-12656?
No fix has been published for CVE-2019-12656 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-2019-12656 being exploited?
There is no known exploitation of CVE-2019-12656 in the wild and no public exploit code.
Sources
Also known as GHSA-6r46-67j7-hr8v.