CVE-2021-21355

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.63% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 74.1% of scored records. A rank, not a probability.

NVD base score

8.6 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-03-23 01:50Z5 YR AGO

Last updated

2024-08-03 18:09Z2 YR AGO

Reserved

2020-12-22

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 8.6)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

Weaknesses

• CWE-434Unrestricted Upload of File with Dangerous TypeBase
• CWE-552Files or Directories Accessible to External PartiesBase

Data version

5.1

Document digest

182aa2a4644f7e08626e1bd60216324aed2b4defc809d49df4e5bee0bb581a5e

• packagist.orghttps://packagist.org/packages/typo3/cms-formx_refsource_MISC
• github.comhttps://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-2r6j-862c-m2v2x_refsource_CONFIRM
• typo3.orghttps://typo3.org/security/advisory/typo3-core-sa-2021-002x_refsource_MISC