CVE-2021-34813
Last modified
CVE-2021-34813 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 4.26% chance of exploitation in the next 30 days.
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/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Matrix | Olm | < 3.2.3 |
References
- https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3Release Notes, Vendor Advisory
- https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolmExploit, Patch, Vendor Advisory
- https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3Release Notes, Vendor Advisory
- https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolmExploit, Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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