Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.
VOLERION
Volerion Security Research

NOT DEFERRED DATABASE

VULNERABILITIES

CVE-2021-34813 Details

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.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b CVEPatchVendor Advisory
https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3 CVERelease NotesVendor Advisory
https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm CVEExploitPatchVendor Advisory
https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b [email protected]PatchVendor Advisory
https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3 [email protected]Release NotesVendor Advisory

see all 6 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-787Out-of-bounds Write[email protected]

Affected Products

ProductVersions
matrix olm
< 3.2.3

CPE

  • cpe:2.3:a:matrix:olm:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2021-34813
NVD Published Date:
Jun 16, 2021
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]