CVE-2021-40823
A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that…
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 matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 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 homeserver 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/javascript sdk
- Source
- cve@mitre.org
References
- https://github.com/matrix-org/matrix-js-sdk/releases/tag/v12.4.1Third Party Advisory
- https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharingVendor Advisory
- https://github.com/matrix-org/matrix-js-sdk/releases/tag/v12.4.1Third 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.