CVE-2020-3496 Cisco Small Business Smart and Managed Switches Denial of Service Vulnerability
Unauthenticated remote attackers can cause a denial of service on Cisco Small Business switches by sending crafted IPv6 packets, requiring vendor patches.
- 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-2020-3496?
CVE-2020-3496 is a medium-severity denial of service vulnerability in Cisco Small Business 250 Series Smart Switches Software, published on 26 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the IPv6 packet processing engine of Cisco Small Business Smart and Managed Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient validation of incoming IPv6 traffic. An attacker could exploit this vulnerability by sending a crafted IPv6 packet through an affected device. A successful exploit could allow the attacker to cause the switch management CLI to stop responding, resulting in a DoS condition. This vulnerability is specific to IPv6 traffic. IPv4 traffic is not affected.
Weakness: CWE-20
Which versions are affected by CVE-2020-3496?
It affects 114 products.
Products include Cisco Sf200-24 Firmware, Cisco Sf200-24fp Firmware, Cisco Sf200-24p Firmware, Cisco Sf200-48 Firmware, Cisco Sf200-48p Firmware, Cisco Sf250-24 Firmware and 108 more.
How do I fix CVE-2020-3496?
No fix has been published for CVE-2020-3496 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-2020-3496 being exploited?
There is no known exploitation of CVE-2020-3496 in the wild and no public exploit code.
Other vulnerabilities in Cisco Small Business 250 Series Smart Switches Software
- CVE-2018-15439 Cisco Small Business Switches Privileged Access Vulnerability
- CVE-2020-3363 Cisco Small Business Smart and Managed Switches Denial of Service Vulnerability
- CVE-2020-3297 Cisco Small Business Smart and Managed Switches Session Management Vulnerability
- CVE-2019-12636 Cisco Small Business Smart and Managed Switches Cross-Site Request Forgery Vulnerability
- CVE-2019-15993 Cisco Small Business Switches Information Disclosure Vulnerability
Sources
Also known as GHSA-p3jf-mcx6-q3cr.