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Fencer Intel
high 7.5

CVE-2017-16932 json

Nokogiri gem, via libxml, is affected by DoS vulnerabilities

published 2017-11-23 8 y ago modified 2026-10-14 26 d ago also GHSA-x2fm-93ww-ggvx , EUVD-2022-5686

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
6.5%
EPSS 6.5% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

parser.c in libxml2 before 2.9.5 does not prevent infinite recursion in parameter entities.

Patch / fix

  • rubygems nokogiri 1.8.1
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • libxml2 Debian 14, Debian 13, Debian 12 2.9.10+dfsg-2

debian advisories DEBIAN-CVE-2017-16932

  • libxml2 Ubuntu 14.04 LTS 2.9.1+dfsg1-3ubuntu4.11
  • libxml2 Ubuntu 16.04 LTS 2.9.3+dfsg1-1ubuntu0.4
  • libxml2 Ubuntu 18.04 LTS 2.9.4+dfsg1-6.1ubuntu1.2

ubuntu advisories UBUNTU-CVE-2017-16932

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libxml2 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 2.9.4-46.54.3
  • python-libxml2 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +10 more 2.9.4-46.54.3
  • libxml2 SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 2.7.6-0.77.10.1
  • libxml2-python SLES for SAP 11 SP4, SLES 11 SP4 2.7.6-0.77.10.1

suse advisories SUSE-SU-2022:1833-1SUSE-SU-2018:0395-1

  • clamav Alpine 3.24, Alpine 3.23, Alpine 3.22 +17 more 0.100.1-r0

alpine advisories ALPINE-CVE-2017-16932

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-16932 updated cvss 7.5

libxml2: Infinite recursion in parameter entities

  • Red Hat CloudForms Management Engine 5 rh-ruby22-rubygem-nokogiri Red Hat Enterprise Linux 5 libxml2 Red Hat Enterprise Linux 6 libxml2, libxml2-python Red Hat Enterprise Linux 7 libxml2, libxml2-python Red Hat Satellite 6 tfm-rubygem-nokogiri, ruby193-rubygem-nokogiri Red Hat Subscription Asset Manager ruby193-rubygem-nokogiri
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise MRG 2 ruby-nokogiri, rubygem-nokogiri
    under investigation
  • Red Hat Software Collections rh-ror42-rubygem-nokogiri, rh-ror50-rubygem-nokogiri, rh-passenger40-rubygem-nokogiri
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-348-10 updated cvss 7.5

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
11 mo ago

Exploit prediction

6.45% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
rubygems nokogiri
<1.8.1
1.8.1

Affected products

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.