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Fencer Vulns
medium 6.5

CVE-2016-8734 json

Apache Subversion's mod_dontdothat module and HTTP clients 1.4.0 through 1.8.16, and 1.9.0 through 1.9.4 are vulnerable to a denial-of-serv…

published 2017-10-16 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-9573

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.4%
EPSS 6.4% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

Apache Subversion's mod_dontdothat module and HTTP clients 1.4.0 through 1.8.16, and 1.9.0 through 1.9.4 are vulnerable to a denial-of-service attack caused by exponential XML entity expansion. The attack can cause the targeted process to consume an excessive amount of CPU resources or memory.

Patch / fix

  • subversion Debian 14, Debian 13, Debian 12 1.9.5-1

debian advisories DEBIAN-CVE-2016-8734

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

ubuntu advisories UBUNTU-CVE-2016-8734

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 1.6.17-1.36.9.1

suse advisories SUSE-SU-2017:2200-1SUSE-SU-2017:2163-1

  • 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-2016-8734 updated cvss 4.4

subversion: unrestricted XML entity expansion in mod_dontdothat and Subversion clients using http(s)://

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

Exploit prediction

6.38% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

Affected products

  • Apache Software Foundation Apache Subversion

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns 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.