Ubuntu.comUB:CVE-2021-21394CVE-2021-21394
4 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
0.002 Low
EPSS
Percentile
57.3%
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.
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 18.04 | noarch | matrix-synapse | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | matrix-synapse | < any | UNKNOWN |
| ubuntu | 22.04 | noarch | matrix-synapse | < any | UNKNOWN |
References
github.com/matrix-org/synapse/pull/9321
github.com/matrix-org/synapse/pull/9393
github.com/matrix-org/synapse/security/advisories/GHSA-w9fg-xffh-p362
launchpad.net/bugs/cve/CVE-2021-21394
nvd.nist.gov/vuln/detail/CVE-2021-21394
pypi.org/project/matrix-synapse/
security-tracker.debian.org/tracker/CVE-2021-21394
www.cve.org/CVERecord?id=CVE-2021-21394
Related
4 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
0.002 Low
EPSS
Percentile
57.3%