MEDIUM
subversion: unrestricted XML entity expansion in mod_dontdothat and Subversion clients using http(s)://
Published Oct 16, 2017
6.5
MEDIUMCVSS 3.0
EPSS 6.38%
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.
Affected products
-
- Version 1.4.0 to 1.8.16StatusaffectedConstraints-
- Version 1.9.0 to 1.9.4StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Apache Software Foundation | Apache Subversion | n/a |
|
Configuration 1
OR
- 1.4.0
- 1.4.1
- 1.4.2
- 1.4.3
- 1.4.4
- 1.4.5
- 1.4.6
- 1.5.0
- 1.5.1
- 1.5.2
- 1.5.3
- 1.5.4
- 1.5.5
- 1.5.6
- 1.5.7
- 1.5.8
- 1.6.0
- 1.6.1
- 1.6.2
- 1.6.3
- 1.6.4
- 1.6.5
- 1.6.6
- 1.6.7
- 1.6.8
- 1.6.9
- 1.6.10
- 1.6.11
- 1.6.12
- 1.6.13
- 1.6.14
- 1.6.15
- 1.6.16
- 1.6.17
- 1.6.18
- 1.6.19
- 1.6.20
- 1.6.21
- 1.6.23
- 1.7.0
- 1.7.1
- 1.7.2
- 1.7.3
- 1.7.4
- 1.7.5
- 1.7.6
- 1.7.7
- 1.7.8
- 1.7.9
- 1.7.10
- 1.7.11
- 1.7.12
- 1.7.13
- 1.7.14
- 1.7.15
- 1.7.16
- 1.7.17
- 1.7.18
- 1.7.19
- 1.7.20
- 1.8.0
- 1.8.1
- 1.8.2
- 1.8.3
- 1.8.4
- 1.8.5
- 1.8.6
- 1.8.7
- 1.8.8
- 1.8.9
- 1.8.10
- 1.8.11
- 1.8.12
- 1.8.13
- 1.8.14
- 1.8.15
- 1.8.16
- 1.9.0
- 1.9.1
- 1.9.2
- 1.9.3
- 1.9.4
Configuration 2
OR
- 8.0
- 9.0
No data.
Red Hat Enterprise Linux 5
subversion
Not affected
Red Hat Enterprise Linux 6
subversion
Not affected
Red Hat Enterprise Linux 7
subversion
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | subversion | Not affected | n/a |
| Red Hat Enterprise Linux 6 | subversion | Not affected | n/a |
| Red Hat Enterprise Linux 7 | subversion | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat mitigation
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.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
6.5 MEDIUM NVD
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
1 other source (Red Hat) ▾
4.4 MEDIUM Red Hat
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 Impact None
Integrity Impact None
Availability Impact High
4.0 MEDIUM NVD
AV:N/AC:L/Au:S/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication Single
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
6.38% 0.06380
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.06380
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (48 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 6.38% (0.06380) | 93.45th | v5 (v2026.06.15) |
| Jun 15, 2026 | 6.38% (0.06380) | 92.75th | v5 (v2026.06.15) |
| Mar 4, 2026 | 12.88% (0.12879) | 93.91th | v4 (v2025.03.14) |
| Mar 1, 2026 | 4.74% (0.04742) | 89.27th | v4 (v2025.03.14) |
| Feb 4, 2026 | 12.88% (0.12879) | 93.86th | v4 (v2025.03.14) |
| Feb 1, 2026 | 4.74% (0.04742) | 89.19th | v4 (v2025.03.14) |
| Jan 4, 2026 | 12.88% (0.12879) | 93.81th | v4 (v2025.03.14) |
| Jan 1, 2026 | 4.74% (0.04742) | 89.14th | v4 (v2025.03.14) |
| Dec 28, 2025 | 12.88% (0.12879) | 93.81th | v4 (v2025.03.14) |
| Dec 27, 2025 | 6.03% (0.06033) | 90.46th | v4 (v2025.03.14) |
| Dec 4, 2025 | 12.88% (0.12879) | 93.77th | v4 (v2025.03.14) |
| Dec 1, 2025 | 4.74% (0.04742) | 89.06th | v4 (v2025.03.14) |
| Nov 4, 2025 | 12.88% (0.12879) | 93.73th | v4 (v2025.03.14) |
| Nov 1, 2025 | 4.74% (0.04742) | 88.97th | v4 (v2025.03.14) |
| Oct 28, 2025 | 12.88% (0.12879) | 93.72th | v4 (v2025.03.14) |
| Oct 27, 2025 | 6.03% (0.06033) | 90.32th | v4 (v2025.03.14) |
| Oct 4, 2025 | 12.88% (0.12879) | 93.77th | v4 (v2025.03.14) |
| Oct 1, 2025 | 4.74% (0.04742) | 89.00th | v4 (v2025.03.14) |
| Sep 4, 2025 | 6.03% (0.06033) | 90.38th | v4 (v2025.03.14) |
| Sep 1, 2025 | 2.80% (0.02805) | 85.65th | v4 (v2025.03.14) |
| Aug 4, 2025 | 6.03% (0.06033) | 90.37th | v4 (v2025.03.14) |
| Aug 1, 2025 | 2.80% (0.02805) | 85.65th | v4 (v2025.03.14) |
| Jul 30, 2025 | 6.03% (0.06033) | 90.35th | v4 (v2025.03.14) |
| Jul 5, 2025 | 7.97% (0.07973) | 91.64th | v4 (v2025.03.14) |
| Jul 1, 2025 | 3.76% (0.03761) | 87.60th | v4 (v2025.03.14) |
| Jun 19, 2025 | 7.97% (0.07973) | 91.62th | v4 (v2025.03.14) |
| Jun 6, 2025 | 9.76% (0.09763) | 92.52th | v4 (v2025.03.14) |
| Jun 1, 2025 | 8.70% (0.08703) | 92.05th | v4 (v2025.03.14) |
| May 4, 2025 | 9.76% (0.09763) | 92.50th | v4 (v2025.03.14) |
| May 1, 2025 | 8.70% (0.08703) | 92.03th | v4 (v2025.03.14) |
| Apr 17, 2025 | 9.76% (0.09763) | 92.47th | v4 (v2025.03.14) |
| Apr 16, 2025 | 8.70% (0.08703) | 91.94th | v4 (v2025.03.14) |
| Apr 15, 2025 | 9.76% (0.09763) | 92.45th | v4 (v2025.03.14) |
| Apr 14, 2025 | 8.70% (0.08703) | 91.68th | v4 (v2025.03.14) |
| Apr 5, 2025 | 9.76% (0.09763) | 92.23th | v4 (v2025.03.14) |
| Apr 4, 2025 | 8.70% (0.08703) | 91.68th | v4 (v2025.03.14) |
| Mar 30, 2025 | 9.76% (0.09763) | 92.20th | v4 (v2025.03.14) |
| Mar 29, 2025 | 17.63% (0.17628) | 91.91th | v4 (v2025.03.14) |
| Mar 17, 2025 | 9.76% (0.09763) | 92.38th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.27% (0.00270) | 68.71th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.38% (0.00383) | 72.31th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.38% (0.00383) | 69.99th | v3 (v2023.03.01) |
| Mar 9, 2023 | 0.45% (0.00452) | 71.22th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.33% (0.00333) | 66.52th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.63% (0.01627) | 75.90th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.63% (0.01627) | 75.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.63% (0.01627) | 73.79th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.63% (0.01627) | 52.68th | v2 (v2022.01.01) |
Weaknesses (2)
References (10)
- http://www.debian.org/security/2017/dsa-3932 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.securityfocus.com/bid/94588 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1037361 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2016-8734 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1397403 Issue Tracking
- https://lists.apache.org/thread.html/7798f5cda1b2a3c70db4be77694b12dec8fcc1a441b00009d44f0e09%40%3Cannounce.apache.org%3E mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2016-8734
- https://subversion.apache.org/security/CVE-2016-8734-advisory.txt x_refsource_CONFIRMIssue TrackingVendor Advisory
- https://www.cve.org/CVERecord?id=CVE-2016-8734
- https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISC
| Link | Providers | Tags |
|---|---|---|
| http://www.debian.org/security/2017/dsa-3932 | vendor-advisoryx_refsource_DEBIANThird Party Advisory | |
| http://www.securityfocus.com/bid/94588 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1037361 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2016-8734 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1397403 | Issue Tracking | |
| https://lists.apache.org/thread.html/7798f5cda1b2a3c70db4be77694b12dec8fcc1a441b00009d44f0e09%40%3Cannounce.apache.org%3E | mailing-listx_refsource_MLIST | |
| https://nvd.nist.gov/vuln/detail/CVE-2016-8734 | ||
| https://subversion.apache.org/security/CVE-2016-8734-advisory.txt | x_refsource_CONFIRMIssue TrackingVendor Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2016-8734 | ||
| https://www.oracle.com/security-alerts/cpuoct2020.html | x_refsource_MISC |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner apache
Published Oct 16, 2017
Updated Sep 16, 2024
Reserved Oct 18, 2016
Link CVE-2016-8734
CISA Vulnrichment
Updated n/a