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CVE-2016-4463

32
FAUCET Score

CVE-2016-4463 describes a stack-based buffer overflow vulnerability in Apache Xerces-C++ versions prior to 3.1.4, impacting Apache and Debian Linux distributions utilizing this library. This high-severity flaw (CVSS 7.5) allows unauthenticated, remote attackers to cause a denial of service by submitting a deeply nested DTD. While the vulnerability has a high EPSS score and FAUCET Risk Score, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.1.3CPE matchmatch criteria
cpe:2.3:a:apache:xerces-c\+\+:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
14.14%
Probability of exploitation in next 30 days
EPSS Percentile
96.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1414 is in the 94th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.4 Extended Update SupportFixed in: xerces-c-0:3.1.1-8.el7_4.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.5 Extended Update SupportFixed in: xerces-c-0:3.1.1-8.el7_5.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: xerces-c-0:3.1.1-9.el7
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenShift Enterprise 2Fixed in: xerces-c
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise MRG 2Fixed in: xerces-c
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise MRG 3Fixed in: xerces-c
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: xerces-c

Vendor Advisories (1)

redhatCVE-2016-4463Moderate

xerces-c: Stack overflow when parsing deeply nested DTD

Jun 29, 2016

References

lists.opensuse.org / opensuse-updates/2016-07/msg00053.html
lists.opensuse.org / opensuse-updates/2016-09/msg00013.html
packetstormsecurity.com / files/137714/Apache-Xerces-C-XML-Parser-Crash.html
access.redhat.com / errata/RHSA-2018:3335
access.redhat.com / errata/RHSA-2018:3506
access.redhat.com / errata/RHSA-2018:3514
issues.apache.org / jira/browse/XERCESC-2069
issues.apache.org / jira/secure/ReleaseNote.jspa
debian.org / security/2016/dsa-3610
oracle.com / security-alerts/cpuapr2020.html
oracle.com / technetwork/security-advisory/cpujul2018-4258247.html
securityfocus.com / archive/1/538784/100/0/threaded
securityfocus.com / bid/91501
securitytracker.com / id/1036211
xerces.apache.org / xerces-c/secadv/CVE-2016-4463.txt