CVE-2019-18835
CRITICALCVSS 9.8/10EPSS 0.86%
Last modified
CVE-2019-18835 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.86% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Matrix | Synapse | < 1.5.0 |
References
- https://github.com/matrix-org/synapse/pull/6262Patch, Third Party Advisory
- https://github.com/matrix-org/synapse/releases/tag/v1.5.0Release Notes, Third Party Advisory
- https://github.com/matrix-org/synapse/pull/6262Patch, Third Party Advisory
- https://github.com/matrix-org/synapse/releases/tag/v1.5.0Release Notes, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-18835?
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 severe is CVE-2019-18835?
CVE-2019-18835 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.86% probability of exploitation in the next 30 days.
How do I fix CVE-2019-18835?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2019-18835?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST