CVE-2019-11842High· 7.5▾ Twilightmatrix-sydent and matrix-synapse Use Cryptographically Weak PRNG
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.3 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 13.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
1.8%
1.8% → 1.8%
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.
matrix-sydent < 1.0.3matrix-synapse < 0.99.3.1Upgrade to a patched release:
matrix-sydent 1.0.3matrix-synapse 0.99.3.1Connected by shared product, vendor, weakness, or advisory.
CVE-2021-29430High· 7.5Sydent vulnerable to denial of service attack via memory exhaustion
CVE-2021-29433Medium· 4.3Sydent DoS (via resource exhaustion) due to improper input validation
CVE-2023-38686Critical· 9.3Sydent does not verify email server certificates
CVE-2021-29432Medium· 5.3Malicious users could abuse Sydent to control the content of invitation emails
CVE-2021-29431High· 7.7SSRF in Sydent due to missing validation of hostnames
CVE-2019-11340Medium· 5.9Matrix Sydent mishandles emails