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[email protected]CVE-2021-21392

HistoryApr 12, 2021 - 10:15 p.m.

CVE-2021-21392

2021-04-1222:15:13

CWE-601

[email protected]

web.nvd.nist.gov

cve-2021-21392

synapse

matrix

homeserver

open federated instant messaging

voip

security advisory

nvd

python

pypi package

ipv6

infrastructure

network vulnerability

4.9 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:S/C:P/I:P/A:N

6.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N

6.5 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

36.9%

JSON

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 requests to user provided domains were not restricted to external IP addresses when transitional IPv6 addresses were used. Outbound requests to federation, identity servers, when calculating the key validity for third-party invite events, sending push notifications, and generating URL previews are affected. This could cause Synapse to make requests to internal infrastructure on dual-stack networks. See referenced GitHub security advisory for details and workarounds.

Affected configurations

Vulners

NVD

Node

matrix-orgsynapseRange<1.28.0

CPENameOperatorVersion
matrix:synapsematrix synapselt1.28.0

CPE	Name	Operator	Version
matrix:synapse	matrix synapse	lt	1.28.0

CNA Affected

[
  {
    "product": "synapse",
    "vendor": "matrix-org",
    "versions": [
      {
        "status": "affected",
        "version": "< 1.28.0"
      }
    ]
  }
]