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 parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. Note that the groups feature is not part of the Matrix specification and the chosen maximum lengths are arbitrary. Not all clients might abide by them. Refer to referenced GitHub security advisory for additional details including workarounds.
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cve-icon MITRE Information

Status: PUBLISHED

Assigner: GitHub_M

Published: 2021-04-12T20:45:18

Updated: 2021-08-02T02:06:20

Reserved: 2020-12-22T00:00:00


Link: CVE-2021-21394

JSON object: View

cve-icon NVD Information

Status : Modified

Published: 2021-04-12T21:15:14.013

Modified: 2023-11-07T03:30:00.553


Link: CVE-2021-21394

JSON object: View

cve-icon Redhat Information

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CWE