What’s Vulnerable › Vulnerabilities

CVE-2016-0762

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 8.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-08-10 · updated 2026-10-08
• Weakness: CWE-203

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.

Affected products

• Apache Tomcat: from 6.0.0 through 6.0.45; from 7.0.0 through 7.0.70; from 8.0 through 8.0.36; from 8.5.0 through 8.5.4; 9.0.0-milestone1, 9.0.0-milestone2, 9.0.0-milestone3, 9.0.0-milestone4, 9.0.0-milestone5, 9.0.0-milestone6 (+3)
• Canonical Ubuntu Linux: 16.04
• Debian Linux: 8.0
• OnCommand Insight: all versions
• NetApp Oncommand Shift: all versions
• NetApp Snap Creator Framework: all versions
• Oracle Corporation Communications Diameter Signaling Router (DSR): from 8.0.0 through 8.5.0
• Oracle Tekelec Platform Distribution: from 7.4.0 through 7.7.1
• RedHat Enterprise Linux Desktop: 7.0
• RedHat Enterprise Linux Eus: 7.4, 7.5, 7.6, 7.7
• RedHat Enterprise Linux Server: 7.0
• RedHat Enterprise Linux Server Aus: 7.4, 7.6, 7.7
• RedHat Enterprise Linux Server Tus: 7.6, 7.7
• RedHat Enterprise Linux Workstation: 7.0
• Red Hat JBoss Enterprise Web Server: 3.0.0

References

• http://rhn.redhat.com/errata/RHSA-2017-0457.html
• http://www.debian.org/security/2016/dsa-3720
• http://www.securityfocus.com/bid/93939
• http://www.securitytracker.com/id/1037144
• https://access.redhat.com/errata/RHSA-2017:0455
• https://access.redhat.com/errata/RHSA-2017:0456
• https://access.redhat.com/errata/RHSA-2017:2247
• https://lists.apache.org/thread.html/1872f96bad43647832bdd84a408794cd06d9cbb557af63085ca10009%40%3Cannounce.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/37220405a377c0182d2afdbc36461c4783b2930fbeae3a17f1333113%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/388a323769f1dff84c9ec905455aa73fbcb20338e3c7eb131457f708%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/39ae1f0bd5867c15755a6f959b271ade1aea04ccdc3b2e639dcd903b%40%3Cdev.tomcat.apache.org%3E

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