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Vulnerability Assessment

Impact

CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 1.13%.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.
Act Now Prioritize within 24-48h. Why: CRITICAL severity.
Patch available 1.1% exploitation probability (EPSS)

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AnalysisAI

libxslt through 1.1.33 allows bypass of a protection mechanism because callers of xsltCheckRead and xsltCheckWrite permit access even upon receiving a -1 error code. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affected Packages

rubygems nokogiri fix: 1.10.3

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in rubygems

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Technical ContextAI · show details

libxslt through 1.1.33 allows bypass of a protection mechanism because callers of xsltCheckRead and xsltCheckWrite permit access even upon receiving a -1 error code. xsltCheckRead can return -1 for a crafted URL that is not actually invalid and is subsequently loaded. Affected products include: Xmlsoft Libxslt, Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Oracle Jdk. Version information: through 1.1.33.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

libxslt through 1.1.33 allows bypass of a protection mechanism because callers of xsltCheckRead and xsltCheckWrite permit access even upon receiving a -1 error code. xsltCheckRead can return -1 for a crafted URL that is not actually invalid and is subsequently loaded.

Threat Intelligence Overview

EPSS Score
1.1%
Top 21% exploitable
Threat Intel
1
1 source
Data Quality
4 sources
Confidence: Medium
NVD CVE.org EPSS GHSA VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 1.1%
Patch available Yes
Active threat No
Deciding rule
CRITICAL severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

50
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +49
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:a:xmlsoft:libxslt:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
cpe:2.3:a:oracle:jdk:8.0:update_221:*:*:*:*:*:*
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:windows:*:*
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:e-series_santricity_management_plug-ins:-:*:*:*:*:vmware_vcenter:*:*
cpe:2.3:a:netapp:e-series_santricity_os_controller:*:*:*:*:*:*:*:*
cpe:2.3:a:netapp:e-series_santricity_storage_manager:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:e-series_santricity_unified_manager:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:e-series_santricity_web_services_proxy:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:element_software:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*
+ 11 more

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xsltGetInheritedNsList in libxslt before 1.1.43 has a use-after-free issue related to exclusion of result prefixes. Rate
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In libxml2 before 2.9.14, several buffer handling functions in buf.c (xmlBuf*) and tree.c (xmlBuffer*) don't check for i
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9.8 Jul 22

libxslt in Apple iOS before 9.3.3, OS X before 10.11.6, iTunes before 12.4.2 on Windows, iCloud before 5.2.1 on Windows,
CVE-2012-6139 MEDIUM POC
5.0 Apr 12

libxslt before 1.1.28 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via an (
CVE-2016-4610 CRITICAL
9.8 Jul 22

libxslt in Apple iOS before 9.3.3, OS X before 10.11.6, iTunes before 12.4.2 on Windows, iCloud before 5.2.1 on Windows,
CVE-2016-4609 CRITICAL
9.8 Jul 22

libxslt in Apple iOS before 9.3.3, OS X before 10.11.6, iTunes before 12.4.2 on Windows, iCloud before 5.2.1 on Windows,
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9.8 Jul 22

libxslt in Apple iOS before 9.3.3, OS X before 10.11.6, iTunes before 12.4.2 on Windows, iCloud before 5.2.1 on Windows,
CVE-2015-7995 MEDIUM POC
5.0 Nov 17

The xsltStylePreCompute function in preproc.c in libxslt 1.1.28 does not check if the parent node is an element, which a
CVE-2017-5029 HIGH
8.8 Apr 24

The xsltAddTextString function in transform.c in libxslt 1.1.29, as used in Blink in Google Chrome prior to 57.0.2987.98
CVE-2021-30560 HIGH
8.8 Aug 03

Use after free in Blink XSLT in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit he
CVE-2013-4520 MEDIUM POC
4.3 Dec 14

xslt.c in libxslt before 1.1.25 allows context-dependent attackers to cause a denial of service (crash) via a stylesheet

Same technique Authentication Bypass

View all
CVE-2015-3306 CRITICAL POC
10.0
CVE-2023-22515 CRITICAL POC
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CVE-2012-4681 CRITICAL POC
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CVE-2013-2465 CRITICAL POC
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CVE-2011-3544 CRITICAL POC
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CVE-2022-40684 CRITICAL POC
9.8
CVE-2025-61882 CRITICAL POC
9.8
CVE-2024-0012 CRITICAL POC
9.3

References

Advisories & patches
PATCH https://gitlab.gnome.org/GNOME/libxslt/commit/e03553605b45c88f0b4b2980adfbbb8f6fca2fd6 PATCH https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html ADVISORY https://vuldb.com/vuln/133326 ADVISORY https://vuldb.com/vuln/143659 REF http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00048.html REF http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00052.html REF http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00053.html REF http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00025.html REF http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00001.html REF http://www.openwall.com/lists/oss-security/2019/04/22/1 REF http://www.openwall.com/lists/oss-security/2019/04/23/5 REF https://lists.debian.org/debian-lts-announce/2019/04/msg00016.html REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36TEYN37XCCKN2XUMRTBBW67BPNMSW4K/ REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GCOAX2IHUMKCM3ILHTMGLHCDSBTLP2JU/ REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SK4YNISS22MJY22YX5I6V2U63QZAUEHA/ REF https://security.netapp.com/advisory/ntap-20191017-0001/ REF https://usn.ubuntu.com/3947-1/ REF https://usn.ubuntu.com/3947-2/

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