CVE-2021-29471

Katalog CVE

CVSS 5.3 · Medium EPSS 1,6%

Kerentanan Uncontrolled Resource Consumption pada matrix synapse, fedoraproject fedora. Skor CVSS 3.1 5.3 (Medium) menurut NVD.

Deskripsi (NVD)

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 1.33.2 "Push rules" can specify conditions under which they will match, including `event_match`, which matches event content against a pattern including wildcards. Certain patterns can cause very poor performance in the matching engine, leading to a denial-of-service when processing moderate length events. The issue is patched in version 1.33.2. A potential workaround might be to prevent users from making custom push rules, by blocking such requests at a reverse-proxy.

Rincian

Terbit di NVD

11 Mei 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

5.3 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-400: Uncontrolled Resource Consumption
CWE-331: Insufficient Entropy

EPSS (30 hari)

1,6% peluang dieksploitasi; lebih tinggi dari 75,8% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c patch · advisory pihak ketiga
• https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85 patch · advisory pihak ketiga
• https://github.com/matrix-org/synapse/releases/tag/v1.33.2 release notes · advisory pihak ketiga
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM...