CVE-2021-21404

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

1.97% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 80.2% of scored records. A rank, not a probability.

NVD base score

7.5 (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:N/I:N/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 20:00Z5 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 7.5)

CNA CVSS vector

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

Weaknesses

• CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

ff927d71635802eeb9ab8b346c20257407d79787c4042d2f71f1126e83126fd9

• github.comhttps://github.com/syncthing/syncthing/security/advisories/GHSA-x462-89pf-6r5hx_refsource_CONFIRM
• pkg.go.devhttps://pkg.go.dev/github.com/syncthing/syncthingx_refsource_MISC
• github.comhttps://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97x_refsource_MISC
• github.comhttps://github.com/syncthing/syncthing/releases/tag/v1.15.0x_refsource_MISC