CVE-2021-28173

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

1.64% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 76.2% of scored records. A rank, not a probability.

NVD base score

9.8 (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:H/I:H/A:H

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

2021-04-06 11:20Z5 YR AGO

Last updated

2024-09-16 22:55Z2 YR AGO

Reserved

2021-03-12

Assigning CNA

twcert

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

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

Weaknesses

• CWE-434Unrestricted Upload of File with Dangerous TypeBase

Data version

5.1

Document digest

a0126e33bbc8eb9afcc225c8a7512c4dbdc2b8b1c1026ed847a963fbf967425e

• www.chtsecurity.comhttps://www.chtsecurity.com/news/7f0874b5-516b-4637-842d-b6fb6c335c66x_refsource_MISC
• www.twcert.org.twhttps://www.twcert.org.tw/tw/cp-132-4620-58f9c-1.htmlx_refsource_MISC