Detections
Analytics
SCA: security update for matrix-sydent (GHSA-wmg4-8cp2-hpg9)
high Tenable Cloud Security Plugin ID 420000
Description
There are packages installed that are affected by a vulnerability referenced in the following CVE:- Sydent is a reference Matrix identity server. Sydent does not limit the size of requests it receives from
HTTP clients. A malicious user could send an HTTP request with a very large body, leading to memory
exhaustion and denial of service. Sydent also does not limit response size for requests it makes to remote
Matrix homeservers. A malicious homeserver could return a very large response, again leading to memory
exhaustion and denial of service. This affects any server which accepts registration requests from
untrusted clients. This issue has been patched by releases 89071a1, 0523511, f56eee3. As a workaround
request sizes can be limited in an HTTP reverse-proxy. There are no known workarounds for the problem with
overlarge responses. (CVE-2021-29430)
See Also
Plugin Details
Severity: High
ID: 420000
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: 3
Percentile: 23.18
Vendor
Vendor Severity: High
CVSS v2
Risk Factor: Medium
Base Score: 5
Temporal Score: 3.7
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS Score Source: CVE-2021-29430
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS v4
Risk Factor: High
Base Score: 8.7
Threat Score: 6.6
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
Exploit Ease: No known exploits are available
Patch Publication Date: 4/19/2021
Vulnerability Publication Date: 4/15/2021
Reference Information
CVE: CVE-2021-29430