CVE-2021-21394
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
matrix-synapsePyPI | < 1.28.0 | 1.28.0 |
Affected products
4cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*range: >0.17.0,<1.28.0
- (no CPE)range: < 1.28.0
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
10- github.com/matrix-org/synapse/pull/9321nvdPatchThird Party AdvisoryWEB
- github.com/matrix-org/synapse/pull/9393nvdPatchThird Party AdvisoryWEB
- github.com/matrix-org/synapse/security/advisories/GHSA-w9fg-xffh-p362nvdPatchThird Party AdvisoryWEB
- github.com/advisories/GHSA-w9fg-xffh-p362ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-21394ghsaADVISORY
- pypi.org/project/matrix-synapse/nvdProductThird Party Advisory
- github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2021-27.yamlghsaWEB
- lists.fedoraproject.org/archives/list/[email protected]/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEYghsaWEB
- pypi.org/project/matrix-synapseghsaWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/nvd
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