How severe is CVE-2021-24033?

CVE-2021-24033 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2021-24033 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24033?

CVE-2021-24033 affects Facebook React-dev-utils. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24033?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-24033 published?

CVE-2021-24033 was published on 2021-03-09 and last updated on 2026-06-17.

CVE-2021-24033

CVE-2021-24033 is a medium-severity vulnerability in Facebook React-dev-utils with a CVSS 3.x base score of 5.6. 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-78.

Key facts

Severity: Medium (CVSS 3.x base score 5.6)
CVSS v2: 6.8
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Facebook React-dev-utils
Published: 2021-03-09
Last modified: 2026-06-17

Description

react-dev-utils prior to v11.0.4 exposes a function, getProcessForPort, where an input argument is concatenated into a command string to be executed. This function is typically used from react-scripts (in Create React App projects), where the usage is safe. Only when this function is manually invoked with user-provided values (ie: by custom code) is there the potential for command injection. If you're consuming it from react-scripts then this issue does not affect you.

Frequently asked questions

What is CVE-2021-24033?: react-dev-utils prior to v11.0.4 exposes a function, getProcessForPort, where an input argument is concatenated into a command string to be executed. This function is typically used from react-scripts (in Create React App projects), where the usage is safe. Only when this function is manually invoked with user-provided values (ie: by custom code) is there the potential for command injection. If you're consuming it from react-scripts then this issue does not affect you.
How severe is CVE-2021-24033?: CVE-2021-24033 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2021-24033 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24033?: CVE-2021-24033 affects Facebook React-dev-utils. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24033?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-24033 published?: CVE-2021-24033 was published on 2021-03-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:facebook:react-dev-utils:*:*:*:*:*:*:*:*

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