CVE-2021-24030Network attack vector

Remote code execution via unquoted protocol arguments

Published Mar 10, 2021 · Updated Aug 3, 2024

Argument injection in Facebook Gameroom before 1.26.0 allows remote attackers to execute code via a malicious fbgames URL. The fbgames protocol handler passes attacker-controlled URL content to the Gameroom executable without properly quoting argument boundaries. Exposure requires Gameroom to have registered the handler on Windows; the published record reports code execution without further constraints.

CVSS severity9.8
Critical
EPSS probability1.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Argument injection in Facebook Gameroom before 1.26.0 allows remote attackers to execute code via a malicious fbgames URL. The fbgames protocol handler passes attacker-controlled URL content to the Gameroom executable without properly quoting argument boundaries. Exposure requires Gameroom to have registered the handler on Windows; the published record reports code execution without further constraints.

The record

CVE
CVE-2021-24030
Published
Mar 10, 2021
Updated
Aug 3, 2024
Vendor
Meta Platforms, Inc.
Product
Facebook Gameroom
Classifications
CWE-88, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <1.26.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Meta Platforms, Inc. · Facebook Gameroomversion=unspecified <1.26.0

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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