What is the CVSS score of CVE-2015-3451?

CVE-2015-3451 has a CVSS 2.0 base score of 5.0 (Medium). CVSS vector: AV:N/AC:L/Au:N/C:P/I:N/A:N. EPSS exploitation probability: 5.0%.

Debian Linux CVE-2015-3451

MEDIUM

Improper Restriction of XML External Entity Reference (CWE-611)

2015-05-12 cve@mitre.org

XXE Debian Canonical Debian Linux Fedora Ubuntu Linux Opensuse Xml Libxml Fedoraproject

5.0

CVSS 2.0 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-611 OWASP Top 10:2025 A02:2025 - Security Misconfiguration ASVS 5.0 V13 - Configuration XML external entity prevention MITRE ATT&CK 2 techniques across 2 tactics: Initial Access, Collection The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 5.0 (MEDIUM). Attack characteristics: network attack vector, low complexity. EPSS exploitation probability: 4.98%.
Exploit ScenarioDerived	A remote attacker could read arbitrary files or perform SSRF through XML processing by sending crafted requests to the affected application.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 5.0% exploitation probability (EPSS)

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AnalysisAI

The _clone function in XML::LibXML before 2.0119 does not properly set the expand_entities option, which allows remote attackers to conduct XML external entity (XXE) attacks via crafted XML data to. Rated medium severity (CVSS 5.0), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Disable external entity processing in XML parsers, use JSON instead of XML where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as XML External Entity (XXE) (CWE-611), which allows attackers to read arbitrary files or perform SSRF through XML processing. The _clone function in XML::LibXML before 2.0119 does not properly set the expand_entities option, which allows remote attackers to conduct XML external entity (XXE) attacks via crafted XML data to the (1) new or (2) load_xml function. Affected products include: Xml-Libxml Project Xml-Libxml, Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Opensuse. Version information: before 2.0119.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 5.0 MEDIUM

AV:N/AC:L/Au:N/C:P/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Confidentiality

Integrity

None

Availability

None

DescriptionCVE.org

Threat Intelligence Overview

EPSS Score

5.0%

Top 10% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

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 MEDIUM

CISA KEV No

Public POC No

EPSS 5.0%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +5

CVSS: +25

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

XML External Entity Injection HIGH

XML External Entity (XXE) attacks exploit XML parsers that process Document Type Definitions (DTDs) without proper restrictions.

Affected Products (CPE)CVE.org

cpe:2.3:a:xml-libxml_project:xml-libxml:*:*:*:*:*:perl:*:*

cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:*

cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*

cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*

cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*

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References

Advisories & patches

ADVISORY https://bitbucket.org/shlomif/perl-xml-libxml/commits/5962fd067580767777e94640b129ae8930a68a30/raw/ REF http://advisories.mageia.org/MGASA-2015-0199.html REF http://cpansearch.perl.org/src/SHLOMIF/XML-LibXML-2.0119/Changes REF http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157448.html REF http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157740.html REF http://lists.opensuse.org/opensuse-updates/2015-09/msg00006.html REF http://www.debian.org/security/2015/dsa-3243 REF http://www.mandriva.com/security/advisories?name=MDVSA-2015:231 REF http://www.openwall.com/lists/oss-security/2015/04/25/2 REF http://www.openwall.com/lists/oss-security/2015/04/30/1 REF http://www.securityfocus.com/bid/74333 REF http://www.ubuntu.com/usn/USN-2592-1

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