CVE-2021-40824: Use of a Broken or Risky Cryptographic Algorithm

September 13, 2021 (updated September 24, 2021)

A logic error in the room key sharing functionality of Element Android exists. This error allows the attacker to decrypt end-to-end encrypted messages sent by affected clients.

References

matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing
nvd.nist.gov/vuln/detail/CVE-2021-40824

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