What is CVE-2021-40824?

CVE-2021-40824 is a medium-severity vulnerability in Matrix Element, classified under Authentication Bypass by Spoofing. CVSS score: 5.9/10. Published 2021-09-13.

How severe is CVE-2021-40824?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Matrix Element

CVE-2021-40824

A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 allows a malicious Matrix homeserver present in an encrypted room to steal room encryptio…

EPSS: 0.007 (47.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Matrix Element
Matrix Matrix-android-sdk2
N/a — versions n/a

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

cve@mitre.org (x_refsource_MISC, Vendor Advisory)
cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-40824?: CVE-2021-40824 is a medium-severity vulnerability in Matrix Element, classified under Authentication Bypass by Spoofing. CVSS score: 5.9/10. Published 2021-09-13.
How severe is CVE-2021-40824?: Medium severity. CVSS v3 base score is 5.9 out of 10.