How severe is CVE-2021-24030?

CVE-2021-24030 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-24030 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24030?

CVE-2021-24030 affects Facebook Gameroom. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24030?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-24030 published?

CVE-2021-24030 was published on 2021-03-10 and last updated on 2026-06-17.

CVE-2021-24030

CVE-2021-24030 is a critical-severity vulnerability in Facebook Gameroom with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-88.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-88
Affected product: Facebook Gameroom
Published: 2021-03-10
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-24030?: CVE-2021-24030 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-24030 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24030?: CVE-2021-24030 affects Facebook Gameroom. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24030?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-24030 published?: CVE-2021-24030 was published on 2021-03-10 and last updated on 2026-06-17.

References

https://www.facebook.com/security/advisories/cve-2021-24030

Affected products (1)

cpe:2.3:a:facebook:gameroom:*:*:*:*:*:*:*:*

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