CVE-2021-34758 Cisco TelePresence Collaboration Endpoint and RoomOS Software Denial of Service Vulnerability
An authenticated local attacker can corrupt shared memory to cause a denial of service on Cisco RoomOS devices.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-34758?
CVE-2021-34758 is a medium-severity denial of service vulnerability in Cisco RoomOS Software, 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
A vulnerability in the memory management of Cisco TelePresence Collaboration Endpoint (CE) Software and Cisco RoomOS Software could allow an authenticated, local attacker to corrupt a shared memory segment, resulting in a denial of service (DoS) condition. This vulnerability is due to insufficient access controls to a shared memory resource. An attacker could exploit this vulnerability by corrupting a shared memory segment on an affected device. A successful exploit could allow the attacker to cause the device to reload. The device will recover from the corruption upon reboot.
Weakness: CWE-732
Which versions are affected by CVE-2021-34758?
It affects 2 products.
Products include Cisco Roomos, Cisco Telepresence Collaboration Endpoint.
How do I fix CVE-2021-34758?
No fix has been published for CVE-2021-34758 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-2021-34758 being exploited?
There is no known exploitation of CVE-2021-34758 in the wild and no public exploit code.
Other vulnerabilities in Cisco RoomOS Software
- CVE-2026-20150 Cisco RoomOS Security Hardening Release - Access Control Vulnerabilities
- CVE-2019-15288 Cisco TelePresence Collaboration Endpoint, TelePresence Codec, and RoomOS Software Privilege Escalation Vulnerability
- CVE-2026-20156 Cisco RoomOS Security Hardening Release - Buffer Management Vulnerabilities
- CVE-2026-20153 Cisco RoomOS Security Hardening Release - Input Validation Vulnerabilities
- CVE-2026-20157 Cisco RoomOS Security Hardening Release - Missing Encryption Vulnerabilities
Sources
Also known as GHSA-m9hj-8j64-3cfq.