CVE-2021-33224

CRITICALNVD 9.89.8—

9.8

File upload vulnerability in Umbraco Forms v.8.7.0 allows unauthenticated attackers to execute arbitrary code via a crafted web.config and asp file.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 89.3%
KEV: Not listed

Published

February 24, 2023

Last Modified

November 21, 2024

References (4)

cve@mitrehttp://umbraco.com
cve@mitrehttps://our.umbraco.com/packages/developer-tools/umbraco-forms
af854a3a-2127-422b-91ae-364da2661108http://umbraco.com
af854a3a-2127-422b-91ae-364da2661108https://our.umbraco.com/packages/developer-tools/umbraco-forms

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-434Unrestricted Upload of File with Dangerous Type

Data Freshness Timeline

(refreshed 10× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
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2026-05-31 00:15 UTCepss_batch
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2026-05-29 13:42 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
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2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 06:13 UTCEG score recompute
2026-05-25 06:12 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-33224?

CVE-2021-33224 is a critical vulnerability published on February 24, 2023. File upload vulnerability in Umbraco Forms v.8.7.0 allows unauthenticated attackers to execute arbitrary code via a crafted web.config and asp file.

When was CVE-2021-33224 disclosed?

CVE-2021-33224 was first published in the National Vulnerability Database on February 24, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-33224 actively exploited?

CVE-2021-33224 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 89.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-33224?

CVE-2021-33224 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-33224?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33224, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-33224

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-33224?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)