Improper input validation in Matrix Synapse
CVE-2021-21394
Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.28.0 Synapse is missing input validation of some pa…
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.015 (72.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Matrix Synapse
- Matrix-org Synapse — versions < 1.28.0
- Fedoraproject Fedora — versions 34
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Third Party Advisory)
- security-advisories@github.com (Product, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (x_refsource_FEDORA, vendor-advisory)
Frequently asked questions
- What is CVE-2021-21394?
- CVE-2021-21394 is a medium-severity vulnerability in Matrix Synapse, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2021-04-12.
- How severe is CVE-2021-21394?
- Medium severity. CVSS v3 base score is 5.3 out of 10.