VDB
CVE-2021-21333
CVE-2021-21333
PUBLISHED
CVSS 6.099999904632568 MEDIUM
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 1.39% · 70.1th percentile
Risk Scores
CVSS 3.1
6.099999904632568
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N
EPSS Score
1.39%
70.1th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:Pro:18.04:LTS | matrix-synapse | *, 0.19.2+dfsg-6, 0.24.0+dfsg-1ubuntu0.1~esm1 |
| Ubuntu:Pro:20.04:LTS | matrix-synapse | 1.6.1-1, 1.7.0-2, 1.7.2-1 |
Timeline
- Mar 26, 2021 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 25, 2021 EPSS Score
- Dec 28, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 4, 2022 EPSS Score
- Mar 1, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- May 3, 2022 EPSS Score
- Sep 6, 2022 EPSS Score
- Nov 8, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2021-21333 third-party-advisory
- https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df third-party-advisory
- https://github.com/matrix-org/synapse/pull/9200 third-party-advisory
- https://github.com/matrix-org/synapse/releases/tag/v1.27.0 third-party-advisory
- https://github.com/matrix-org/synapse/security/advisories/GHSA-c5f8-35qr-q4fm third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2021-21333 third-party-advisory