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Fencer Intel
medium 6.8

CVE-2016-2167 json

The canonicalize_username function in svnserve/cyrus_auth.c in Apache Subversion before 1.8.16 and 1.9.x before 1.9.4, when Cyrus SASL auth…

published 2016-05-05 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-3255

cvss
6.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.8%
EPSS 6.8% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

The canonicalize_username function in svnserve/cyrus_auth.c in Apache Subversion before 1.8.16 and 1.9.x before 1.9.4, when Cyrus SASL authentication is used, allows remote attackers to authenticate and bypass intended access restrictions via a realm string that is a prefix of an expected repository realm string.

Patch / fix

  • subversion Debian 14, Debian 13, Debian 12 1.9.4-1

debian advisories DEBIAN-CVE-2016-2167

  • subversion Ubuntu 14.04 LTS 1.8.8-1ubuntu3.3
  • subversion Ubuntu 16.04 LTS 1.9.3-2ubuntu1.1

ubuntu advisories UBUNTU-CVE-2016-2167

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

  • subversion SLE Software Development Kit 12 SP3, SLE Software Development Kit 12 SP2 1.8.19-25.3.1
  • subversion Studio Onsite 1.3, SLE Software Development Kit 11 SP4 1.6.17-1.35.1
  • subversion SLE Software Development Kit 12 SP1, SLE Software Development Kit 12 1.8.10-21.1

suse advisories SUSE-SU-2017:2200-1SUSE-SU-2016:1511-1SUSE-SU-2016:1249-1

  • subversion openSUSE Tumbleweed 1.9.5-1.1

opensuse advisories openSUSE-SU-2024:10538-1

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-2016-2167 updated cvss 3.6

subversion: svnserve/sasl may authenticate users using the wrong realm

  • Red Hat Enterprise Linux 5 subversion Red Hat Enterprise Linux 6 subversion, mod_dav_svn, subversion-kde, subversion-perl, subversion-ruby, subversion-gnome, +2 more Red Hat Enterprise Linux 7 subversion, mod_dav_svn, subversion-kde, subversion-libs, subversion-perl, subversion-ruby, +4 more
    affected: no fix planned “Will not fix”

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

Exploit prediction

6.81% 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 3.0 6.8 CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 4.9 AV:N/AC:M/Au:S/C:P/I:P/A:N

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.