Is CVE-2016-4449 in the CISA KEV catalog?

No. CVE-2016-4449 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-4449?

CVE-2016-4449 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2016-4449?

CVE-2016-4449 has an EPSS score of 1.66% (74th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-4449?

Upgrade libxml2 on debian 11 to 2.9.3+dfsg1-1.1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2016-4449

HIGHEPSS 74th pctl

7.1

CVSS v3

NVD

Description

XML external entity (XXE) vulnerability in the xmlStringLenDecodeEntities function in parser.c in libxml2 before 2.9.4, when not in validating mode, allows context-dependent attackers to read arbitrary files or cause a denial of service (resource consumption) via unspecified vectors.

CWE-20Improper Input Validation

How to fix

Remediation Available

libxml2Debian

Fixed in:2.9.3+dfsg1-1.1CVE-2016-4449

libxml2Ubuntu

Fixed in:2.9.1+dfsg1-3ubuntu4.8USN-2994-1

Fixed in:2.9.3+dfsg1-1ubuntu0.1USN-2994-1

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 VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.66%probability of exploitation in 30 days

74thpercentile

Elevated risk: more likely to be exploited than 74% of all known CVEs.

References

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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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 2026-05-06.