CVE-2018-16515

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

1.53% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 74.3% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.0/AV:N/AC:L/PR:L/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

2018-09-18 21:00Z8 YR AGO

Last updated

2024-08-05 10:24Z2 YR AGO

Reserved

2018-09-05

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-347Improper Verification of Cryptographic SignatureBase

Data version

5.1

Document digest

1ec609e91c47fd0645cf19533bcf2d561c0735a402ca91a22d56119a27e7343c

• github.comhttps://github.com/matrix-org/synapse/issues/3796#event-1833126269x_refsource_CONFIRM
• lists.fedoraproject.orgFEDORA-2018-6db422c637https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IRW7YR2H3ASUSYX4AO4KMY3FNVDNYW3P/vendor-advisoryx_refsource_FEDORA
• matrix.orghttps://matrix.org/blog/2018/09/06/critical-security-update-synapse-0-33-3-1/x_refsource_CONFIRM