What is CVE-2021-42109?

CVE-2021-42109 is a critical-severity vulnerability in Vitec Avediastream M9305, classified under Initialization of a Resource with an Insecure Default. CVSS score: 9.8/10. Published 2021-10-08.

How severe is CVE-2021-42109?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Vitec Avediastream M9305

CVE-2021-42109

VITEC Exterity IPTV products through 2021-04-30 allow privilege escalation to root.

Published 2021-10-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (75.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-1188 — Initialization of a Resource with an Insecure Default

References

whitehoodhacker.net/posts/2021-10-04-the-big-rick (Exploit, Third Party Advisory)
www.exterity.com (Vendor Advisory)

Frequently asked questions

What is CVE-2021-42109?: CVE-2021-42109 is a critical-severity vulnerability in Vitec Avediastream M9305, classified under Initialization of a Resource with an Insecure Default. CVSS score: 9.8/10. Published 2021-10-08.
How severe is CVE-2021-42109?: Critical severity. CVSS v3 base score is 9.8 out of 10.