What is CVE-2021-34758?

CVE-2021-34758 is a medium-severity vulnerability in Cisco Roomos Software, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 4.4/10. Published 2021-10-06.

How severe is CVE-2021-34758?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in Cisco Roomos Software

CVE-2021-34758

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.

Published 2021-10-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (7.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-tpce-rmo… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-34758?: CVE-2021-34758 is a medium-severity vulnerability in Cisco Roomos Software, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 4.4/10. Published 2021-10-06.
How severe is CVE-2021-34758?: Medium severity. CVSS v3 base score is 4.4 out of 10.