Skip to content
Fencer Intel
medium 5.9

CVE-2016-0762 json

Observable Discrepancy in Apache Tomcat

published 2017-08-10 9 y ago modified 2026-10-08 31 d ago also GHSA-wxcp-f2c8-x6xv , EUVD-2022-5668

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.0%
EPSS 8.0% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.apache.tomcat:tomcat 6.0.46, 7.0.72, 8.0.37, 8.5.5, 9.0.0.M10
  • tomcat6 Ubuntu 14.04 LTS 6.0.39-1ubuntu0.1
  • tomcat6 Ubuntu 16.04 LTS 6.0.45+dfsg-1ubuntu0.1
  • tomcat7 Ubuntu 16.04 LTS 7.0.68-1ubuntu0.3
  • tomcat8 Ubuntu 16.04 LTS 8.0.32-1ubuntu1.3

ubuntu advisories UBUNTU-CVE-2016-0762

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tomcat RHEL 7 7.0.76-2.el7
  • tomcat-lib RHEL 7 7.0.76-2.el7
  • tomcat-jsvc RHEL 7 7.0.76-2.el7
  • tomcat-javadoc RHEL 7 7.0.76-2.el7
  • tomcat-webapps RHEL 7 7.0.76-2.el7
  • tomcat-el-2.2-api RHEL 7 7.0.76-2.el7
  • tomcat-docs-webapp RHEL 7 7.0.76-2.el7
  • tomcat-jsp-2.2-api RHEL 7 7.0.76-2.el7

red hat advisories RHSA-2017:2247RHSA-2017:0456RHSA-2017:0455

  • tomcat6 SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 6.0.53-0.56.1
  • tomcat SLES for SAP 12 SP1, SLES 12 SP1 8.0.32-10.13.2
  • tomcat SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 8.0.36-17.1
  • tomcat SLES for SAP 12, SLES 12-LTSS 7.0.78-7.13.4

suse advisories SUSE-SU-2017:1660-1SUSE-SU-2017:1632-1SUSE-SU-2016:3079-1SUSE-SU-2016:3081-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-0762 updated cvss 3.7

tomcat: timing attack in Realm implementation

  • Red Hat Enterprise Linux 5 tomcat5 Red Hat Enterprise Linux 6 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat6-el-2.1-api, +4 more
    affected: no fix planned “Will not fix”
  • Red Hat JBoss BRMS 5 jbossweb jbossweb Red Hat JBoss Data Grid 6 jbossweb jbossweb Red Hat JBoss Data Virtualization 6 jbossweb jbossweb
    affected: no fix planned “Out of support scope”
  • Red Hat JBoss Enterprise Web Server 2 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat7 tomcat7, +6 more
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Enterprise Web Server 3 tomcat7 tomcat7, tomcat8 tomcat8
    affected: no fix available “Fix deferred”
  • Red Hat JBoss Fuse 6 jbossweb jbossweb
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Fuse Service Works 6 jbossweb jbossweb Red Hat JBoss Operations Network 3 jbossweb jbossweb
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux Client (v. 7) tomcat 7.0.76-2.el7, tomcat-servlet-3.0-api 7.0.76-2.el7 Red Hat Enterprise Linux Client Optional (v. 7) tomcat 7.0.76-2.el7, tomcat-lib 7.0.76-2.el7, tomcat-jsvc 7.0.76-2.el7, tomcat-javadoc 7.0.76-2.el7, tomcat-webapps 7.0.76-2.el7, tomcat-el-2.2-api 7.0.76-2.el7, +3 more Red Hat Enterprise Linux ComputeNode (v. 7) tomcat 7.0.76-2.el7, tomcat-servlet-3.0-api 7.0.76-2.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) tomcat 7.0.76-2.el7, tomcat-lib 7.0.76-2.el7, tomcat-jsvc 7.0.76-2.el7, tomcat-javadoc 7.0.76-2.el7, tomcat-webapps 7.0.76-2.el7, tomcat-el-2.2-api 7.0.76-2.el7, +3 more Red Hat Enterprise Linux Server (v. 7) tomcat 7.0.76-2.el7, tomcat-lib 7.0.76-2.el7, tomcat-webapps 7.0.76-2.el7, tomcat-el-2.2-api 7.0.76-2.el7, tomcat-jsp-2.2-api 7.0.76-2.el7, tomcat-admin-webapps 7.0.76-2.el7, +1 more Red Hat Enterprise Linux Server Optional (v. 7) tomcat 7.0.76-2.el7, tomcat-lib 7.0.76-2.el7, tomcat-jsvc 7.0.76-2.el7, tomcat-javadoc 7.0.76-2.el7, tomcat-webapps 7.0.76-2.el7, tomcat-el-2.2-api 7.0.76-2.el7, +3 more
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) tomcat 7.0.76-2.el7, tomcat-lib 7.0.76-2.el7, tomcat-webapps 7.0.76-2.el7, tomcat-el-2.2-api 7.0.76-2.el7, tomcat-jsp-2.2-api 7.0.76-2.el7, tomcat-admin-webapps 7.0.76-2.el7, +1 more Red Hat Enterprise Linux Workstation Optional (v. 7) tomcat-jsvc 7.0.76-2.el7, tomcat-javadoc 7.0.76-2.el7, tomcat-docs-webapp 7.0.76-2.el7
    fixed: vendor fix RHSA-2017:2247
  • Red Hat JBoss Web Server 3.1
    fixed: vendor fix RHSA-2017:0457
show 3 more
  • Red Hat JBoss Web Server 3.1 for RHEL 6 tomcat7 7.0.70-16.ep7.el6, tomcat8 8.0.36-17.ep7.el6, tomcat7-lib 7.0.70-16.ep7.el6, tomcat8-lib 8.0.36-17.ep7.el6, tomcat7-jsvc 7.0.70-16.ep7.el6, tomcat8-jsvc 8.0.36-17.ep7.el6, +31 more
    fixed: vendor fix RHSA-2017:0455
  • Red Hat JBoss Web Server 3.1 for RHEL 7 tomcat7 7.0.70-16.ep7.el7, tomcat8 8.0.36-17.ep7.el7, tomcat7-lib 7.0.70-16.ep7.el7, tomcat8-lib 8.0.36-17.ep7.el7, tomcat7-jsvc 7.0.70-16.ep7.el7, tomcat8-jsvc 8.0.36-17.ep7.el7, +31 more
    fixed: vendor fix RHSA-2017:0456
  • Red Hat JBoss Enterprise Application Platform 5 jbossweb jbossweb Red Hat JBoss Enterprise Application Platform 6 jbossweb jbossweb
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
31 d ago

Exploit prediction

7.99% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N
GitHub 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat:tomcat
>=9.0.0M1, <9.0.0.M10
>=8.5.0, <8.5.5
>=8.0.0.RC1, <8.0.37
>=7.0.0, <7.0.72
>=6.0.0, <6.0.46
9.0.0.M10
8.5.5
8.0.37
7.0.72
6.0.46

Affected products

  • Apache Software Foundation Apache Tomcat

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.