CVE-2019-1814 Cisco Small Business 300 Series Managed Switches DHCP Denial of Service Vulnerability
An unauthenticated remote attacker can cause a denial of service on Cisco Small Business 300 Series switches by sending crafted DHCP packets that exhaust system memory.
- 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-2019-1814?
CVE-2019-1814 is a medium-severity denial of service vulnerability in Cisco Small Business 300 Series Managed Switches, published on 15 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the interactions between the DHCP and TFTP features for Cisco Small Business 300 Series (Sx300) Managed Switches could allow an unauthenticated, remote attacker to cause the device to become low on system memory, which in turn could lead to an unexpected reload of the device and result in a denial of service (DoS) condition on an affected device. The vulnerability is due to a failure to free system memory when an unexpected DHCP request is received. An attacker could exploit this vulnerability by sending a crafted DHCP packet to the targeted device. A successful exploit could allow the attacker to cause an unexpected reload of the device.
Which versions are affected by CVE-2019-1814?
It affects 27 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 21 more.
How do I fix CVE-2019-1814?
No fix has been published for CVE-2019-1814 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-2019-1814 being exploited?
There is no known exploitation of CVE-2019-1814 in the wild and no public exploit code.
Other vulnerabilities in Cisco Small Business 300 Series Managed Switches
- CVE-2020-3147 Cisco Small Business Switches Denial of Service Vulnerability
- CVE-2018-0465 Cisco Small Business 300 Series Managed Switches Cross-Site Scripting Vulnerability
- CVE-2018-0407 Cross-site scripting in Cisco Small Business 300 Series Managed Switches unknown
- CVE-2018-0408 Cross-site scripting in Cisco Small Business 300 Series Managed Switches unknown
Sources
Also known as GHSA-r8m5-hhgx-g34x.