How severe is CVE-2016-8734?

CVE-2016-8734 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-8734 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-8734?

CVE-2016-8734 primarily affects Apache Subversion. In total, 84 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-8734?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-8734 published?

CVE-2016-8734 was published on 2017-10-16 and last updated on 2026-06-17.

CVE-2016-8734

CVE-2016-8734 is a medium-severity vulnerability in Apache Subversion with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 6% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Apache Subversion
Published: 2017-10-16
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2016-8734?: 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.
How severe is CVE-2016-8734?: CVE-2016-8734 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2016-8734 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-8734?: CVE-2016-8734 primarily affects Apache Subversion. In total, 84 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-8734?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-8734 published?: CVE-2016-8734 was published on 2017-10-16 and last updated on 2026-06-17.

References

Affected products (84)

cpe:2.3:a:apache:subversion:1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.4.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.4.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.4.3:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.4.4:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.4.5:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.4.6:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.5.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.5.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.5.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.5.3:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.5.4:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.5.5:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.5.6:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.5.7:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.5.8:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.3:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.4:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.5:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.6:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.7:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.8:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.9:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.10:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.11:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.12:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.13:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.14:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.15:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.16:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.17:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.18:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.19:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.20:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.21:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.6.23:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.7.0:*:*:*:*:*:*:*

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