What is CVE-2021-24030?

CVE-2021-24030 is a critical-severity vulnerability in Facebook Gameroom, classified under Argument Injection. CVSS score: 9.8/10. Published 2021-03-10.

How severe is CVE-2021-24030?

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

Vulnerability in Facebook Gameroom

CVE-2021-24030

The fbgames protocol handler registered as part of Facebook Gameroom does not properly quote arguments passed to the executable. That allows a malicious URL to cause code execution. This issue affects versions prior to v1.26.0.

Published 2021-03-10 · 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: 0.018 (77.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.0% 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: 0.018 · change: +0.001

Affected products

Facebook Gameroom — versions 1.26.0, unspecified
Facebook Gameroom

Weakness classification (CWE)

CWE-88 — Argument Injection

References

www.facebook.com/security/advisories/cve-2021-24030 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-24030?: CVE-2021-24030 is a critical-severity vulnerability in Facebook Gameroom, classified under Argument Injection. CVSS score: 9.8/10. Published 2021-03-10.
How severe is CVE-2021-24030?: Critical severity. CVSS v3 base score is 9.8 out of 10.