CVE-2021-34813
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductMatrix Olm
PublishedJun 16, 2021
First seenJun 16, 2021
How to fix
Update
- matrix olm3.2.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| matrix olm | v < 3.2.3 | 3.2.3 |
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