CVE-2021-29430: matrix sydent

csirt@kutim:~/threat-intel/cve/CVE-2021-29430

CVSS 7.5 · High EPSS 1,8%

Kerentanan Improper Input Validation pada matrix sydent. Skor CVSS 3.1 7.5 (High) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD: 15 April 2021
Terakhir diubah: 17 Juni 2026
Status NVD: Modified
CVSS 3.1: 7.5 (High), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-20: Improper Input Validation
CWE-400: Uncontrolled Resource Consumption
CWE-770: Allocation of Resources Without Limits or Throttling
EPSS (30 hari): 1,8% peluang dieksploitasi; lebih tinggi dari 78,3% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
matrix	sydent	Semua versi sebelum 2.3.0

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://github.com/matrix-org/sydent/commit/0523511d2fb40f2738f8a8549868f44b96e5dab7 patch · advisory pihak ketiga
https://github.com/matrix-org/sydent/commit/89071a1a754c69a50deac89e6bb74002d4cda19d patch · advisory pihak ketiga
https://github.com/matrix-org/sydent/commit/f56eee315b6c44fdd9f6aa785cc2ec744a594428 patch · advisory pihak ketiga
https://github.com/matrix-org/sydent/security/advisories/GHSA-wmg4-8cp2-hpg9 patch · advisory pihak ketiga
https://github.com/matrix-org/sydent/releases/tag/v2.3.0 release notes · advisory pihak ketiga
https://pypi.org/project/matrix-sydent/ product · advisory pihak ketiga

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:10 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.