Buffer overflow in Matrix Olm
CVE-2021-34813
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 co…
Vulnerability class: Buffer Overflow
EPSS: 0.043 (90.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Matrix Olm
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Exploit, Patch, x_refsource_MISC, Vendor Advisory)
- cve@mitre.org (x_refsource_MISC, Release Notes, Vendor Advisory)
- cve@mitre.org (Patch, x_refsource_MISC, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-34813?
- CVE-2021-34813 is a critical-severity vulnerability in Matrix Olm, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-06-16.
- How severe is CVE-2021-34813?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-34813 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.