CVE-2019-18835
Improper Verification of Cryptographic Signature in matrix-synapse
8.6
HIGH
CVSS 3.1
EPSS 0.19%
Description
Matrix Synapse before 1.5.0 mishandles signature checking on some federation APIs. Events sent over /send_join, /send_leave, and /invite may not be correctly signed, or may not come from the expected servers.
How to fix CVE-2019-18835
To remediate CVE-2019-18835, upgrade the affected package to a fixed version below.
- Debian/matrix-synapse—upgrade to 1.5.0-1 or later
- —upgrade to 1.5.0 or later
- —upgrade to 1.5.0 or later
Is CVE-2019-18835 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 1.5.0-1
- from 0, < 1.5.0
- from 0, < 1.5.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L |