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CVE-2017-16931

32
FAUCET Score

CVE-2017-16931 is a critical vulnerability affecting libxml2 versions prior to 2.9.5, where a parsing error in parser.c allows for mishandling of parameter-entity references due to incorrect handling of the '%' character in DTD names. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with no user interaction, leading to complete compromise of confidentiality, integrity, and availability. While the vulnerability has a high FAUCET Risk Score of 81/100, there is currently no public exploit code available, no evidence of active exploitation, and minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.9.4CPE matchmatch criteria
cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.28%
Probability of exploitation in next 30 days
EPSS Percentile
90.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0428 is in the 83rd percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (9)

github_advisorypatch availablevia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: CloudForms Management Engine 5Fixed in: rh-ruby22-rubygem-nokogiri
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: libxml2
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libxml2
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libxml2
redhatend of lifevia redhat_api
Product: Red Hat Enterprise MRG 2Fixed in: rubygem-nokogiri
redhatend of lifevia redhat_api
Product: Red Hat Satellite 6Fixed in: ruby193-rubygem-nokogiri
redhatend of lifevia redhat_api
Product: Red Hat Satellite 6Fixed in: tfm-rubygem-nokogiri
redhatend of lifevia redhat_api
Product: Red Hat Subscription Asset ManagerFixed in: ruby193-rubygem-nokogiri

Vendor Advisories (1)

redhatCVE-2017-16931Moderate

libxml2: Mishandling parameter-entity references

Jun 5, 2017

References

bugzilla.gnome.org / show_bug.cgi
Permissions Required
github.com / GNOME/libxml2/commit/e26630548e7d138d2c560844c43820b6767251e3
PatchThird Party Advisory
lists.debian.org / debian-lts-announce/2017/11/msg00041.html
oracle.com / /security-alerts/cpujul2021.html
xmlsoft.org / news.html
Release NotesVendor Advisory