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Vulnerability record · CVE-2016-8734 · published 16 October 2017

CVE-2016-8734: Apache subversion uncontrolled resource consumption vulnerability

Apache · Subversion

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.

6.5 CVSS 3.0 Medium EPSS 6.4% · top 6.6% CWE-400 · Uncontrolled resource consumption
6.5CVSS 3.0 base score, v2 4.0
6.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.debian.org/security/2017/dsa-3932 Third Party Advisory
http://www.securityfocus.com/bid/94588 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1037361 Third Party AdvisoryVDB Entry
https://lists.apache.org/thread.html/7798f5cda1b2a3c70db4be77694b12dec8fcc1a441b00009d44f0e09%40%3Cannounce.apache.org%3
https://subversion.apache.org/security/CVE-2016-8734-advisory.txt Issue TrackingVendor Advisory
https://www.oracle.com/security-alerts/cpuoct2020.html
http://www.debian.org/security/2017/dsa-3932 Third Party Advisory
http://www.securityfocus.com/bid/94588 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1037361 Third Party AdvisoryVDB Entry
https://lists.apache.org/thread.html/7798f5cda1b2a3c70db4be77694b12dec8fcc1a441b00009d44f0e09%40%3Cannounce.apache.org%3
https://subversion.apache.org/security/CVE-2016-8734-advisory.txt Issue TrackingVendor Advisory
https://www.oracle.com/security-alerts/cpuoct2020.html

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Source: NIST National Vulnerability Database (record CVE-2016-8734), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.