CVE catalog
CVE-2021-41079
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 speci
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 7.18% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | tomcat9 | sid | 9.0.122-1 | fixed |
| Debian | tomcat9 | forky | 9.0.122-1 | fixed |
| Debian | tomcat9 | trixie | 9.0.95-1 | fixed |
| Debian | tomcat9 | bookworm | 9.0.70-2 | fixed |
| Cpe | tomcat | Not reported | 8.5.64 | fixed |
| Cpe | tomcat | Not reported | 9.0.44 | fixed |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | debian_linux | Not reported | Not reported | unknown |
| Cpe | debian_linux | Not reported | Not reported | unknown |
| Cpe | debian_linux | Not reported | Not reported | unknown |
| Cpe | management_services_for_element_software_and_netapp_hci | Not reported | Not reported | unknown |
| Ubuntu | tomcat9 | 18.04 | 9.0.16-3~18.04.1 | vulnerable |
| Ubuntu | tomcat9 | 18.04 | 9.0.16-3ubuntu0.18.04.1 | vulnerable |
| Ubuntu | tomcat9 | 18.04 | 9.0.16-3ubuntu0.18.04.2 | fixed |
| Ubuntu | tomcat8 | pro | 8.5.21-1ubuntu1 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.29-1 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.30-1 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.30-1ubuntu1 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.30-1ubuntu1.2 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.30-1ubuntu1.3 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.30-1ubuntu1.4 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.1 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.2 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.3 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.3+esm1 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.3+esm2 | fixed |
| Ubuntu | tomcat9 | 20.04 | 9.0.24-1 | vulnerable |
| Ubuntu | tomcat9 | 20.04 | 9.0.27-1 | vulnerable |
| Ubuntu | tomcat9 | 20.04 | 9.0.31-1 | vulnerable |
| Ubuntu | tomcat9 | 20.04 | 9.0.31-1ubuntu0.1 | vulnerable |
| Ubuntu | tomcat9 | 20.04 | 9.0.31-1ubuntu0.2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | tomcat9 | source | sid | 9.0.53-1 | not yet assigned | Not reported | Not reported |
| Debian | tomcat9 | source | forky | 9.0.53-1 | not yet assigned | Not reported | Not reported |
| Debian | tomcat9 | source | trixie | 9.0.53-1 | not yet assigned | Not reported | Not reported |
| Debian | tomcat9 | source | bookworm | 9.0.53-1 | not yet assigned | Not reported | Not reported |
| Cpe | tomcat | cpe | Not reported | 8.5.64 | Not reported | NVD-CVE-2021-41079 | Not reported |
| Cpe | tomcat | cpe | Not reported | 9.0.44 | Not reported | NVD-CVE-2021-41079 | Not reported |
| Ubuntu | tomcat9 | deb | 18.04 | 9.0.16-3ubuntu0.18.04.2 | Not reported | UBUNTU-CVE-2021-41079 | Not reported |
| Ubuntu | tomcat8 | deb | pro | 8.5.39-1ubuntu1~18.04.3+esm2 | Not reported | UBUNTU-CVE-2021-41079 | Not reported |
| Ubuntu | tomcat9 | deb | 20.04 | 9.0.31-1ubuntu0.2 | Not reported | UBUNTU-CVE-2021-41079 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libtomcat9-java]Fixed
Source package: [tomcat9]
Details (2)
9.0.70-2· all · bookwormFixed · Fixed:
9.0.53-1nvd · tomcat9 · debian · bookworm; nvd · tomcat9 · debian · 12
9.0.70-2· all · bookwormFixed · Fixed:
9.0.53-1nvd · tomcat9 · debian · bookworm; nvd · tomcat9 · debian · 12
[Debian 13 (Trixie)]
- [libtomcat9-java]Fixed
Source package: [tomcat9]
Details (2)
9.0.95-1· all · trixieFixed · Fixed:
9.0.53-1nvd · tomcat9 · debian · 13
9.0.95-1· all · trixieFixed · Fixed:
9.0.53-1nvd · tomcat9 · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2021_3602-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2021-41079]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-41079]
- [https://osv.dev/vulnerability/DLA-2764-1]
- [https://osv.dev/vulnerability/DSA-4986-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-41079]
- [https://security-tracker.debian.org/tracker/CVE-2021-41079]
- [https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-41079.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2021/wid-sec-w-2024-0673.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]