CVEvulnerability
CVE-2021-34813
9.8 CRITICAL
Official page ↗
- Status
- Modified
- Published
- 2021-06-16
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P
- Weaknesses
- CWE-787
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.
Affected configurations
• matrix olm (< 3.2.3)
Related
Weakness · CWE (1)
- CWE-787 Out-of-bounds Write weakness
References
- https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b Patch, Vendor Advisory
- https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3 Release Notes, Vendor Advisory
- https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm Exploit, Patch, Vendor Advisory
- https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b Patch, Vendor Advisory
- https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3 Release Notes, Vendor Advisory
- https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm Exploit, Patch, Vendor Advisory