VDB

CVE-2021-21333

CVE-2021-21333 PUBLISHED

Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.27.0, the notification emails sent for notifications for missed messages or for an expiring account are subject to HTML injection. In the case of the notification for missed messages, this could allow an attacker to insert forged content into the email. The account expiry feature is not enabled by default and the HTML injection is not controllable by an attacker. This is fixed in version 1.27.0.

EPSS 0.38% · 60.1th percentile

Risk Scores

EPSS Score
0.38%
60.1th percentile

Affected Products

VendorProductVersions
Ubuntu:Pro:18.04:LTSmatrix-synapse*, 0.19.2+dfsg-6, 0.24.0+dfsg-1ubuntu0.1~esm1
Ubuntu:Pro:20.04:LTSmatrix-synapse1.6.1-1, 1.7.0-2, 1.7.2-1

Exploit Intelligence

Timeline

  • Mar 26, 2021 CVE Published
  • Apr 14, 2021 EPSS Score
  • Jun 23, 2021 EPSS Score
  • Aug 24, 2021 EPSS Score
  • Oct 26, 2021 EPSS Score
  • Jan 6, 2022 EPSS Score
  • Feb 4, 2022 EPSS Score
  • Feb 28, 2022 EPSS Score
  • Apr 1, 2022 EPSS Score
  • May 1, 2022 EPSS Score
  • Jul 3, 2022 EPSS Score
  • Sep 4, 2022 EPSS Score

References

Open in Interactive Console →
$ Console Community · 100/wk Open console ›