CVE-2020-3147 Cisco Small Business Switches Denial of Service Vulnerability

High 8.6 Published 29 Jan 2020 Updated 15 Nov 2024

Unauthenticated remote attackers can cause a denial of service on Cisco Small Business Switches by sending malicious requests to the web interface.

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-2020-3147?

CVE-2020-3147 is a high-severity denial of service vulnerability in Cisco Small Business 300 Series Managed Switches, published on 29 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the web UI of Cisco Small Business Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper validation of requests sent to the web interface. An attacker could exploit this vulnerability by sending a malicious request to the web interface of an affected device. A successful exploit could allow the attacker to cause an unexpected reload of the device, resulting in a DoS condition. This vulnerability affects firmware releases prior than 1.3.7.18

Weakness: CWE-20

Which versions are affected by CVE-2020-3147?

It affects 57 products.

Products include Cisco Sf300-08 Firmware, Cisco Sf300-24 Firmware, Cisco Sf300-24mp Firmware, Cisco Sf300-24p Firmware, Cisco Sf300-24pp Firmware, Cisco Sf300-48 Firmware and 51 more.

How do I fix CVE-2020-3147?

No fix has been published for CVE-2020-3147 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-2020-3147 being exploited?

There is no known exploitation of CVE-2020-3147 in the wild and no public exploit code.

Sources

Also known as GHSA-fch4-wxg7-rpqw.