CVE-2021-39163

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

0.90% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 57.0% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

2021-08-31 16:00Z5 YR AGO

Last updated

2024-08-04 01:58Z2 YR AGO

Reserved

2021-08-16

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Low (CVSS 3.1)

CNA CVSS vector

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

Weaknesses

• CWE-200Exposure of Sensitive Information to an Unauthorized ActorClass
• CWE-863Incorrect AuthorizationClass

Data version

5.1

Document digest

b2888ec68f8abbec9b6f4af815dcdb4d2cfda4d0cb3cb0a9be910d03bfb4572b

• github.comhttps://github.com/matrix-org/synapse/security/advisories/GHSA-jj53-8fmw-f2w2x_refsource_CONFIRM
• github.comhttps://github.com/matrix-org/synapse/commit/cb35df940ax_refsource_MISC
• github.comhttps://github.com/matrix-org/synapse/releases/tag/v1.41.1x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-2e8ed15b14https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PXT7ID7DNBRN2TVTETU3SYQHJKEG6PXN/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-f12fdca1bfhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2VHDEPCZ22GJFMZCWA2XZAGPOEV72POF/vendor-advisoryx_refsource_FEDORA