CVE-2021-34776 Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities
An adjacent attacker can execute code or cause a reload on Cisco Small Business Smart Switches via LLDP vulnerabilities.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-34776?
CVE-2021-34776 is a medium-severity memory corruption vulnerability in Cisco Small Business 200 Series Smart Switches, published on 6 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Multiple vulnerabilities exist in the Link Layer Discovery Protocol (LLDP) implementation for Cisco Small Business 220 Series Smart Switches. An unauthenticated, adjacent attacker could perform the following: Execute code on the affected device or cause it to reload unexpectedly Cause LLDP database corruption on the affected device For more information about these vulnerabilities, see the Details section of this advisory. Note: LLDP is a Layer 2 protocol. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent). Cisco has released firmware updates that address these vulnerabilities.
Weakness: CWE-120
Which versions are affected by CVE-2021-34776?
It affects 16 products.
Products include Cisco Business 220-16p-2g Firmware, Cisco Business 220-16t-2g Firmware, Cisco Business 220-24fp-4g Firmware, Cisco Business 220-24fp-4x Firmware, Cisco Business 220-24p-4g Firmware, Cisco Business 220-24p-4x Firmware and 10 more.
How do I fix CVE-2021-34776?
No fix has been published for CVE-2021-34776 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-34776 being exploited?
There is no known exploitation of CVE-2021-34776 in the wild and no public exploit code.
Other vulnerabilities in Cisco Small Business 200 Series Smart Switches
- CVE-2021-34744 Cisco Business 220 Series Smart Switches Static Key and Password Vulnerabilities
- CVE-2021-34757 Cisco Business 220 Series Smart Switches Static Key and Password Vulnerabilities
- CVE-2021-34775 Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities
- CVE-2021-34777 Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities
- CVE-2021-34778 Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities
Sources
Also known as GHSA-9ph8-cf44-5v83.