CVE-2021-21357

HIGHNVD 8.38.3—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.3 under NVD CVSS v3. EPSS exploit probability: 1.1%, top 22% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 8.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 8.7.40, 9.5.25, 10.4.14, 11.1.1 due to improper input validation, attackers can by-pass restrictions of predefined options and submit arbitrary data in the Form Designer backend module of the Form Framework. In the default configuration of the Form Framework this allows attackers to explicitly allow arbitrary mime-types for file uploads - however, default _fileDenyPattern_ successfully blocked files like _.htaccess_ or _malicious.php_. Besides that, attackers can persist those files in any writable directory of the corresponding TYPO3 installation. A valid backend user account with access to the form module is needed to exploit this vulnerability. This is fixed in versions 8.7.40, 9.5.25, 10.4.14, 11.1.1.

CVSS v3
8.3
EG Score
8.3(medium)
EPSS
73.2%
KEV
Not listed

Published

March 23, 2021

Last Modified

November 21, 2024

References (6)

Affected Packages

(3 across 1 ecosystem)
Packagist(3)
PackageVulnerable rangeFixed inDependents
typo3/cmsv9.0.0 ... v9.5.9 (34 versions)9.5.25—
typo3/cms-corev9.0.0 ... v9.5.9 (34 versions)9.5.25—
typo3/cms-formv11.0.0, v11.1.011.1.1—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-21 15:22 UTCEPSS rescore
  2. 2026-07-21 15:22 UTCEPSS rescore
  3. 2026-07-20 17:04 UTCEPSS rescore
  4. 2026-07-19 14:28 UTCEPSS rescore
  5. 2026-07-19 02:26 UTCEPSS rescore
  6. 2026-07-18 23:59 UTCOSV refresh
  7. 2026-07-18 10:02 UTCEPSS rescore
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  1. 2026-07-05 02:28 UTCEPSS rescore
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  4. 2026-07-02 16:57 UTCEPSS rescore
  5. 2026-07-01 15:03 UTCEPSS rescore
  6. 2026-07-01 06:48 UTCOSV refresh
  7. 2026-06-30 23:20 UTCEPSS rescore
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  9. 2026-06-28 14:05 UTCEPSS rescore
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  24. 2026-06-19 19:24 UTCEPSS rescore
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  26. 2026-06-18 17:51 UTCEPSS rescore
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  30. 2026-06-15 17:46 UTCEPSS rescore
  31. 2026-06-14 23:15 UTCEPSS rescore
  32. 2026-06-13 22:58 UTCEPSS rescore
  33. 2026-06-13 11:13 UTCOSV refresh
  34. 2026-06-12 23:10 UTCEPSS rescore
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  36. 2026-06-11 13:58 UTCEPSS rescore
  37. 2026-06-10 22:16 UTCEPSS rescore
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  39. 2026-06-10 13:20 UTCEPSS rescore
  40. 2026-06-08 14:15 UTCEPSS rescore
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  42. 2026-06-07 15:23 UTCEPSS rescore
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  44. 2026-06-06 13:46 UTCEPSS rescore
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  65. 2026-05-26 19:32 UTCEG score recompute
  66. 2026-05-26 13:42 UTCEPSS rescore
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  68. 2026-05-26 07:17 UTCEPSS rescore
  69. 2026-05-26 07:17 UTCEPSS rescore
  70. 2026-05-24 16:49 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-21357?
CVE-2021-21357 is a high vulnerability published on March 23, 2021. TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 8.7.40, 9.5.25, 10.4.14, 11.1.1 due to improper input validation, attackers can by-pass restrictions of predefined options and submit arbitrary data in the Form Designer backend module of the Form Framework.…
When was CVE-2021-21357 disclosed?
CVE-2021-21357 was first published in the National Vulnerability Database on March 23, 2021, 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-2021-21357 actively exploited?
CVE-2021-21357 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 73.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-21357?
CVE-2021-21357 has a CVSS v3 base score of 8.3 (NVD).
How do I remediate CVE-2021-21357?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-21357, 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.

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