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TI-2021-17922 Aliases CVE-2021-41079GHSA-59g9-7gfx-c72p

Apache Tomcat DoS with unexpected TLS packet

Priority MEDIUM 49CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 5 fixed, 4 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-835.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.07182 94th percentileScored 2026-11-07
Fix Partial org.apache.tomcat:tomcat (Maven): 10.0.4, 9.0.44, 8.5.64Red Hat: 4 advisoriesRed Hat: 5 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache TomcatApache Tomcat 8.5 8.5.0 to 8.5.63; Apache Tomcat 9 9.0.0-M1 to 9.0.43; Apache Tomcat 10 10.0.0-M1 to 10.0.2—No fix listedCNA
—org.apache.tomcat:tomcat (Maven)10.0.0 to before 10.0.410.0.4Patch availableGHSA-59g9-7gfx-c72p
—org.apache.tomcat:tomcat (Maven)9.0.0 to before 9.0.449.0.44Patch availableGHSA-59g9-7gfx-c72p
—org.apache.tomcat:tomcat (Maven)8.5.0 to before 8.5.648.5.64Patch availableGHSA-59g9-7gfx-c72p
  • Apache Tomcat VendorApache Affected Apache Tomcat 8.5 8.5.0 to 8.5.63; Apache Tomcat 9 9.0.0-M1 to 9.0.43; Apache Tomcat 10 10.0.0-M1 to 10.0.2 Fixed in — No fix listed CNA
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 10.0.0 to before 10.0.4 Fixed in 10.0.4 Patch available GHSA-59g9-7gfx-c72p
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 9.0.0 to before 9.0.44 Fixed in 9.0.44 Patch available GHSA-59g9-7gfx-c72p
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 8.5.0 to before 8.5.64 Fixed in 8.5.64 Patch available GHSA-59g9-7gfx-c72p

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*8.5.0 to before 8.5.64; 9.0.0 to before 9.0.44; 10.0.0 – 10.0.2VulnerableApache
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*11.0VulnerableDebian
cpe:2.3:a:netapp:management_services_for_element_software_and_netapp_hci:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
  • cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* Versions 8.5.0 to before 8.5.64; 9.0.0 to before 9.0.44; 10.0.0 – 10.0.2 Vulnerable ·Apache
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
  • cpe:2.3:a:netapp:management_services_for_element_software_and_netapp_hci:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp

Remediation

  • Fix · GHSA-59g9-7gfx-c72p org.apache.tomcat:tomcat (Maven) Fixed in 10.0.4 Advisory →
  • Fix · GHSA-59g9-7gfx-c72p org.apache.tomcat:tomcat (Maven) Fixed in 9.0.44 Advisory →
  • Fix · GHSA-59g9-7gfx-c72p org.apache.tomcat:tomcat (Maven) Fixed in 8.5.64 Advisory →

Red Hat 4 advisories

  • RHSA-2022:5532 Released 2022-07-07 · Red Hat rating Important
    Red Hat Fuse 7.11.0 release and security update
    • Red Hat Fuse 7.11
  • RHSA-2022:1179 Released 2022-04-12 · Red Hat rating Important
    Red Hat support for Spring Boot 2.5.10 update
    • Red Hat Support for Spring Boot 2.5.10
  • RHSA-2021:3743 Released 2021-10-06 · Red Hat rating Important
    Red Hat JBoss Web Server 5.5.1 Security Update
    • Red Hat JBoss Web Server 5
Show 1 more Red Hat advisories
  • RHSA-2021:3741 Released 2021-10-06 · Red Hat rating Important
    Red Hat JBoss Web Server 5.5.1 Security Update
    • Red Hat JBoss Web Server 5.5 for RHEL 7 Server jws5-tomcat-9.0.43-13.redhat_00013.1.el7jws, jws5-tomcat-admin-webapps-9.0.43-13.redhat_00013.1.el7jws, jws5-tomcat-docs-webapp-9.0.43-13.redhat_00013.1.el7jws +9
    • Red Hat JBoss Web Server 5.5 for RHEL 8 jws5-tomcat-9.0.43-13.redhat_00013.1.el8jws, jws5-tomcat-admin-webapps-9.0.43-13.redhat_00013.1.el8jws, jws5-tomcat-docs-webapp-9.0.43-13.redhat_00013.1.el8jws +7

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 8AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat JBoss Fuse 6AffectedNo fix planned: Out of support scope
Red Hat OpenStack Platform 10 (Newton)AffectedNo fix planned: Out of support scope
Red Hat Fuse 7.11Fixed RHSA-2022:5532
Red Hat JBoss Web Server 5Fixed RHSA-2021:3743
Red Hat JBoss Web Server 5.5 for RHEL 7 ServerFixed RHSA-2021:3741
Red Hat JBoss Web Server 5.5 for RHEL 8Fixed RHSA-2021:3741
Red Hat Support for Spring Boot 2.5.10Fixed RHSA-2022:1179
Not affected: 9 products
  • Red Hat Decision Manager 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat JBoss Data Grid 6
  • Red Hat JBoss Data Virtualization 6
  • Red Hat JBoss Enterprise Application Platform 6
  • Red Hat JBoss Web Server 3
  • Red Hat OpenStack Platform 13 (Queens)
  • Red Hat Process Automation 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-41079
  2. 2026-10-03 Alias added: GHSA-59g9-7gfx-c72p
  3. 2026-10-08 CISA SSVC decision points changed

References

Advisory 5

Other 7

  • TI-2025-18529 Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUT KEVCVSS 3.1CRITICAL 10.0
  • TI-2020-01862 Improper privilege management in Apache Tomcat KEVCVSS 3.1CRITICAL 9.8
  • TI-2016-07192 Improper access control in Apache Tomcat KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-09342 Unrestricted file upload in Apache Tomcat KEVCVSS 3.1HIGH 8.1
  • TI-2017-09340 Unrestricted file upload in Apache Tomcat KEVCVSS 3.1HIGH 8.1
  • TI-2026-26741 Apache Tomcat: Fix for CVE-2026-29146 allowed bypass of EncryptInterceptor KEVCVSS 3.1HIGH 7.5
See all 273 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences