CVE-2019-1886 Cisco Web Security Appliance HTTPS Certificate Denial of Service Vulnerability

High 8.6 Published 4 Jul 2019 Updated 19 Nov 2024

Remote attackers can cause a denial of service by sending requests with malformed SSL certificates through the HTTPS decryption feature.

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-2019-1886?

CVE-2019-1886 is a high-severity denial of service vulnerability in Cisco Asyncos, published on 4 Jul 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the HTTPS decryption feature of Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to insufficient validation of Secure Sockets Layer (SSL) server certificates. An attacker could exploit this vulnerability by installing a malformed certificate in a web server and sending a request to it through the Cisco WSA. A successful exploit could allow the attacker to cause an unexpected restart of the proxy process on an affected device.

Weakness: CWE-295, CWE-20

Which versions are affected by CVE-2019-1886?

It affects 2 products.

Products include Cisco Asyncos, Cisco Web Security Appliance.

How do I fix CVE-2019-1886?

No fix has been published for CVE-2019-1886 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-2019-1886 being exploited?

There is no known exploitation of CVE-2019-1886 in the wild and no public exploit code.

All Cisco Asyncos vulnerabilities

Sources

Also known as GHSA-8ggj-222w-8pp7.