CVE-2021-34813: Buffer Overflow
First published: Wed Jun 16 2021(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Matrix Olm | <3.2.3 |
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Reference Links
Frequently Asked Questions
What is CVE-2021-34813?
CVE-2021-34813 is a vulnerability in Matrix libolm before version 3.2.3 that allows a malicious Matrix homeserver to crash a client.
What is the severity of CVE-2021-34813?
The severity of CVE-2021-34813 is critical with a CVSS score of 9.8.
How does CVE-2021-34813 affect Matrix libolm?
CVE-2021-34813 affects Matrix libolm before version 3.2.3.
How can CVE-2021-34813 be exploited?
CVE-2021-34813 can potentially lead to remote code execution for some nonstandard build configurations.
How can I fix CVE-2021-34813?
To fix CVE-2021-34813, upgrade Matrix libolm to version 3.2.3 or later.
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