Public Date:
1397403: CVE-2016-8734 subversion: unrestricted XML entity expansion in mod_dontdothat and Subversion clients using http(s)://

The MITRE CVE dictionary describes this issue as:

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.

Find out more about CVE-2016-8734 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 3.5
Base Metrics AV:N/AC:M/Au:S/C:N/I:N/A:P
Access Vector Network
Access Complexity Medium
Authentication Single
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial

CVSS v3 metrics

NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.

CVSS3 Base Score 4.4
CVSS3 Base Metrics CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity High
Privileges Required High
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Impact None
Availability Impact High

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 7 subversion Will not fix
Red Hat Enterprise Linux 6 subversion Not affected
Red Hat Enterprise Linux 5 subversion Not affected


This issue was discovered by Florian Weimer (Red Hat).


Only Apache+Subversion servers that have the "DontDoThatConfigFile" configuration option present are affected by this flaw. This option is not enabled in default httpd or mod_dav_svn configuration as shipped with Red Hat Enterprise Linux.

Last Modified

CVE description copyright © 2017, The MITRE Corporation