Is CVE-2017-16931 in the CISA KEV catalog?

No. CVE-2017-16931 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-16931?

CVE-2017-16931 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2017-16931?

CVE-2017-16931 has an EPSS score of 4.28% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-16931?

Upgrade libxml2 on debian 11 to 2.9.4+dfsg1-3.1 or later.

CVE & CISA-KEV Catalog

CVE-2017-16931

CRITICALEPSS 90th pctl

9.8

CVSS v3

NVD

Description

parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the xmlParserHandlePEReference function in the case of a '%' character in a DTD name.

CWE-119Buffer Overflow

How to fix

Remediation Available

libxml2Debian

Fixed in:2.9.4+dfsg1-3.1CVE-2017-16931

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.28%probability of exploitation in 30 days

90thpercentile

Elevated risk: more likely to be exploited than 90% of all known CVEs.

References

Patch1

github.com

Vendor Advisory1

xmlsoft.org

Other references3

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.