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 encryption keys (via…
Does this matter?
Lower severity and a low EPSS score (0.66%). Track it; it rarely justifies an emergency change on its own.
Description
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 encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the attacker to decrypt end-to-end encrypted messages sent by affected clients.
- CVSS 3.1
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.66% probability · 50th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-290
- Affected
- matrix/element · matrix/matrix-android-sdk2
- Source
- cve@mitre.org
References
- https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2Patch, Third Party Advisory
- https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharingVendor Advisory
- https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2Patch, Third Party Advisory
- https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharingVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.