Detections
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SCA: security update for matrix-synapse (GHSA-v936-j8gp-9q3p)

medium Tenable Self-Hosted Container Security Plugin ID 419213

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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 1.25.0, requests to
 user provided domains were not restricted to external IP addresses when calculating the key validity for
 third-party invite events and sending push notifications. This could cause Synapse to make requests to
 internal infrastructure. The type of request was not controlled by the user, although limited modification
 of request bodies was possible. For the most thorough protection server administrators should remove the
 deprecated `federation_ip_range_blacklist` from their settings after upgrading to Synapse v1.25.0 which
 will result in Synapse using the improved default IP address restrictions. See the new
 `ip_range_blacklist` and `ip_range_whitelist` settings if more specific control is necessary.
 (CVE-2021-21273)

See Also

https://github.com/advisories/GHSA-v936-j8gp-9q3p

Plugin Details

Severity: Medium

ID: 419213

Version: Revision 1.4

Type: Local

Family: SCA Checks

Published: 1/23/2025

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 8.67

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2021-21273

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 1.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 2/26/2021

Vulnerability Publication Date: 2/26/2021

Reference Information

CVE: CVE-2021-21273

cwe: CWE-601