CVE-2021-34813

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

Matrix libolm before 3.2.3 allows a malicious Matrix homeserver to crash a client (while it is attempting to retrieve an Olm encrypted room key backup from the homeserver) because olm_pk_decrypt has a stack-based buffer overflow. Remote code execution might be possible for some nonstandard build configurations.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-787

Affected software

No affected versions have been published.

Timeline

Published
Jun 16, 2021
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-34813: Critical severity, CVSS 9.8 | Vulnix