CVE-2021-21425

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

80.60% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 99.6% 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

2021-04-07 18:20Z5 YR AGO

Last updated

2024-08-03 18:09Z2 YR AGO

Reserved

2020-12-22

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CNA CVSS vector

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

Weaknesses

• CWE-284Improper Access ControlPillar

Data version

5.1

Document digest

1a7ef46fb681fb3860e2b3decf1b4d857b465678a9b441442d73830d41281880

• pentest.bloghttps://pentest.blog/unexpected-journey-7-gravcms-unauthenticated-arbitrary-yaml-write-update-leads-to-code-execution/x_refsource_MISC
• github.comhttps://github.com/getgrav/grav-plugin-admin/security/advisories/GHSA-6f53-6qgv-39pjx_refsource_CONFIRM
• packetstormsecurity.comhttp://packetstormsecurity.com/files/162283/GravCMS-1.10.7-Remote-Command-Execution.htmlx_refsource_MISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/162457/GravCMS-1.10.7-Remote-Command-Execution.htmlx_refsource_MISC