CVE-2016-0762
MEDIUMCVSS 5.9/10EPSS 7.68%
Last modified
CVE-2016-0762 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. The Realm implementations in Apache Tomcat versions 9.0.0.M1 to 9.0.0.M9, 8.5.0 to 8.5.4, 8.0.0.RC1 to 8.0.36, 7.0.0 to 7.0.70 and 6.0.0 to 6.0.45 did not process the supplied password if the supplied user name did not exist. This made a timing attack possible to determine valid user names. EPSS estimates a 7.68% chance of exploitation in the next 30 days.
Description
The Realm implementations in Apache Tomcat versions 9.0.0.M1 to 9.0.0.M9, 8.5.0 to 8.5.4, 8.0.0.RC1 to 8.0.36, 7.0.0 to 7.0.70 and 6.0.0 to 6.0.45 did not process the supplied password if the supplied user name did not exist. This made a timing attack possible to determine valid user names. Note that the default configuration includes the LockOutRealm which makes exploitation of this vulnerability harder.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Apache | Tomcat | >= 6.0.0, <= 6.0.45 | — |
| Apache | Tomcat | >= 7.0.0, <= 7.0.70 | — |
| Apache | Tomcat | >= 8.0, <= 8.0.36 | — |
| Apache | Tomcat | >= 8.5.0, <= 8.5.4 | — |
| Apache | Tomcat | 9.0.0 | Milestone1 |
| Canonical | Ubuntu Linux | 16.04 | — |
| Debian | Debian Linux | 8.0 | — |
| Redhat | Jboss Enterprise Web Server | 3.0.0 | — |
| Redhat | Enterprise Linux Desktop | 7.0 | — |
| Redhat | Enterprise Linux Eus | 7.4 | — |
| Redhat | Enterprise Linux Eus | 7.5 | — |
| Redhat | Enterprise Linux Eus | 7.6 | — |
| Redhat | Enterprise Linux Eus | 7.7 | — |
| Redhat | Enterprise Linux Server | 7.0 | — |
| Redhat | Enterprise Linux Server Aus | 7.4 | — |
| Redhat | Enterprise Linux Server Aus | 7.6 | — |
| Redhat | Enterprise Linux Server Aus | 7.7 | — |
| Redhat | Enterprise Linux Server Tus | 7.6 | — |
| Redhat | Enterprise Linux Server Tus | 7.7 | — |
| Redhat | Enterprise Linux Workstation | 7.0 | — |
| Netapp | Oncommand Insight | All versions | — |
| Netapp | Oncommand Shift | All versions | — |
| Netapp | Snap Creator Framework | All versions | — |
| Oracle | Communications Diameter Signaling Router | >= 8.0.0, <= 8.5.0 | — |
| Oracle | Tekelec Platform Distribution | >= 7.4.0, <= 7.7.1 | — |
References
- http://rhn.redhat.com/errata/RHSA-2017-0457.htmlThird Party Advisory
- http://www.debian.org/security/2016/dsa-3720Third Party Advisory
- http://www.securityfocus.com/bid/93939Broken Link
- http://www.securitytracker.com/id/1037144Broken Link
- https://access.redhat.com/errata/RHSA-2017:0455Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0456Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2247Third Party Advisory
- https://security.netapp.com/advisory/ntap-20180605-0001/Third Party Advisory
- https://usn.ubuntu.com/4557-1/Third Party Advisory
- https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0457.htmlThird Party Advisory
- http://www.debian.org/security/2016/dsa-3720Third Party Advisory
- http://www.securityfocus.com/bid/93939Broken Link
- http://www.securitytracker.com/id/1037144Broken Link
- https://access.redhat.com/errata/RHSA-2017:0455Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0456Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2247Third Party Advisory
- https://security.netapp.com/advisory/ntap-20180605-0001/Third Party Advisory
- https://usn.ubuntu.com/4557-1/Third Party Advisory
- https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2016-0762?
The Realm implementations in Apache Tomcat versions 9.0.0.M1 to 9.0.0.M9, 8.5.0 to 8.5.4, 8.0.0.RC1 to 8.0.36, 7.0.0 to 7.0.70 and 6.0.0 to 6.0.45 did not process the supplied password if the supplied user name did not exist. This made a timing attack possible to determine valid user names. Note that the default configuration includes the LockOutRealm which makes exploitation of this vulnerability harder.
How severe is CVE-2016-0762?
CVE-2016-0762 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 7.68% probability of exploitation in the next 30 days.
How do I fix CVE-2016-0762?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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