CVE-2021-41079
HIGH7.5EPSS 0.10%Apache Tomcat DoS with unexpected TLS packet
Published: 9/20/2021Modified: 4/28/2026
Description
Apache Tomcat 8.5.0 to 8.5.63, 9.0.0-M1 to 9.0.43 and 10.0.0-M1 to 10.0.2 did not properly validate incoming TLS packets. When Tomcat was configured to use NIO+OpenSSL or NIO2+OpenSSL for TLS, a specially crafted packet could be used to trigger an infinite loop resulting in a denial of service.
Affected packages (5)
- Bitnami/tomcat>= 8.5.0, < 8.5.64, >= 9.0.0, < 9.0.44, >= 10.0.0, < 10.0.3
- Debian/tomcat8from 0, < 8.5.54-0+deb9u8
- Debian/tomcat9from 0, < 9.0.43-2~deb11u2
- Debian/tomcat9from 0, < 9.0.31-1~deb10u6
- Maven/org.apache.tomcat:tomcat>= 10.0.0, < 10.0.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References (13)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-41079
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-41079
- PATCHhttps://github.com/apache/tomcat
- WEBhttps://github.com/apache/tomcat/commit/34115fb3c83f6cd97772232316a492a4cc5729e0
- WEBhttps://lists.apache.org/thread.html/r6b6b674e3f168dd010e67dbe6848b866e2acf26371452fdae313b98a@%3Cusers.tomcat.apache.org%3E
- WEBhttps://lists.apache.org/thread.html/r6b6b674e3f168dd010e67dbe6848b866e2acf26371452fdae313b98a%40%3Cusers.tomcat.apache.org%3E
- WEBhttps://lists.apache.org/thread.html/rb4de81ac647043541a32881099aa6eb5a23f1b7fd116f713f8ab9dbe@%3Cdev.tomcat.apache.org%3E
- WEBhttps://lists.apache.org/thread.html/rb4de81ac647043541a32881099aa6eb5a23f1b7fd116f713f8ab9dbe%40%3Cdev.tomcat.apache.org%3E
- WEBhttps://lists.apache.org/thread.html/rccdef0349fdf4fb73a4e4403095446d7fe6264e0a58e2df5c6799434%40%3Cannounce.tomcat.apache.org%3E
- WEBhttps://lists.debian.org/debian-lts-announce/2021/09/msg00012.html
- WEBhttps://security.netapp.com/advisory/ntap-20211008-0005
- WEBhttps://security.netapp.com/advisory/ntap-20211008-0005/
- WEBhttps://www.debian.org/security/2021/dsa-4986