CVE-2019-11842
HIGH7.5EPSS 0.41%matrix-sydent and matrix-synapse Use Cryptographically Weak PRNG
Published: 5/24/2022Modified: 5/20/2026
Also known as:DEBIAN-CVE-2019-11842
Description
An issue was discovered in Matrix Sydent before 1.0.3 and Synapse before 0.99.3.1. Random number generation is mishandled, which makes it easier for attackers to predict a Sydent authentication token or a Synapse random ID.
Affected packages (4)
- Debian/matrix-synapsefrom 0, < 0.99.2-5
- PyPI/matrix-sydentfrom 0, < 1.0.3
- PyPI/matrix-synapsefrom 0, < 0.99.3.1
- PyPI/matrix-synapsefrom 0, < 0.99.3.1
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:N/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
References (6)
- ADVISORYhttps://github.com/advisories/GHSA-gwf7-vfjf-wf6x
- ADVISORYhttps://matrix.org/blog/2019/05/03/security-updates-sydent-1-0-3-synapse-0-99-3-1-and-riot-android-0-9-0-0-8-99-0-8-28-a/
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2019-11842
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2019-11842
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2019-185.yaml
- WEBhttps://matrix.org/blog/2019/05/03/security-updates-sydent-1-0-3-synapse-0-99-3-1-and-riot-android-0-9-0-0-8-99-0-8-28-a