CVE-2021-29431

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

1.19% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 65.8% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

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

2021-04-15 21:00Z5 YR AGO

Last updated

2024-08-03 22:02Z2 YR AGO

Reserved

2021-03-30

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.7)

CNA CVSS vector

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

Weaknesses

• CWE-20Improper Input ValidationClass
• CWE-918Server-Side Request Forgery (SSRF)Base

Data version

5.1

Document digest

1108377f2ac7497f8bbf4dfe5d244004020ee478d07c77e79bc5e1c26e094c04

• pypi.orghttps://pypi.org/project/matrix-sydent/x_refsource_MISC
• github.comhttps://github.com/matrix-org/sydent/releases/tag/v2.3.0x_refsource_MISC
• github.comhttps://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4x_refsource_CONFIRM
• github.comhttps://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5fx_refsource_MISC
• github.comhttps://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00ax_refsource_MISC
• github.comhttps://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3x_refsource_MISC
• github.comhttps://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310ax_refsource_MISC