CVE-2016-4447

Exp

The xmlParseElementDecl function in parser.c in libxml2 before 2.9.4 allows context-dependent attackers to cause a denial of service (heap-based buffer underread and application crash) via a crafted file, involving xmlParseName.

Published: 2016-06-09 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-4447 is rated High Exploit Risk (74.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.66%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2016-4447

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2016-4447

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-13 3.14% 2.66% -0.48%
2 2026-05-12 3.01% 3.14% +0.13%
3 2026-05-11 — 3.01% —

Full EPSS history (53 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-4447

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2016-4447

OS Trackers for CVE-2016-4447

vendor priority summary link
debian not yet assigned CVE-2016-4447 not yet assigned priority: Debian including 1 source packages (libxml2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-4447
redhat medium — https://access.redhat.com/security/cve/CVE-2016-4447
suse medium CVE-2016-4447 severity moderate: SUSE including 19 source package names (libxml2-2-2.9.1-24.1, libxml2-2-32bit-2.9.1-24.1, …), 76 product×package rows across 20 product lines (SUSE Liberty Linux 7, SUSE Linux Enterprise Desktop 12, … (20 product lines)): Fixed 76. https://www.suse.com/security/cve/CVE-2016-4447/
ubuntu low CVE-2016-4447 low priority: Ubuntu including 1 source packages (libxml2), 7 status rows across 7 suites (precise, trusty, upstream, wily, xenial, yakkety, zesty): released 5, not-affected 2. https://ubuntu.com/security/CVE-2016-4447

Affected software / configurations for CVE-2016-4447

Vendor Product Version Raw CPE
hp icewall_federation_agent 3.0 cpe:2.3:a:hp:icewall_federation_agent:3.0:*:*:*:*:*:*:*
canonical ubuntu_linux 12.04 cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 15.10 cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
oracle vm_server 3.3 cpe:2.3:o:oracle:vm_server:3.3:*:*:*:*:*:*:*
oracle vm_server 3.4 cpe:2.3:o:oracle:vm_server:3.4:*:*:*:*:*:*:*
apple itunes 12.4.1 cpe:2.3:a:apple:itunes:12.4.1:*:*:*:*:*:*:*
apple iphone_os <= 9.3.2 cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple mac_os_x <= 10.11.5 cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
apple tvos <= 9.2.1 cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
apple watchos <= 2.2.1 cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
xmlsoft libxml2 <= 2.9.3 cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*
mcafee web_gateway >= 7.5.0.0, <= 7.5.2.10 cpe:2.3:a:mcafee:web_gateway:*:*:*:*:*:*:*:*
mcafee web_gateway >= 7.6.0.0, <= 7.6.2.3 cpe:2.3:a:mcafee:web_gateway:*:*:*:*:*:*:*:*

References for CVE-2016-4447

URL Tags
http://lists.apple.com/archives/security-announce/2016/Jul/msg00000.html Mailing List Third Party Advisory
http://lists.apple.com/archives/security-announce/2016/Jul/msg00001.html Mailing List Third Party Advisory
http://lists.apple.com/archives/security-announce/2016/Jul/msg00002.html Mailing List Third Party Advisory
http://lists.apple.com/archives/security-announce/2016/Jul/msg00003.html Mailing List Not Applicable
http://lists.apple.com/archives/security-announce/2016/Jul/msg00005.html Mailing List Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-2957.html Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/05/25/2 Mailing List Third Party Advisory
http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html Third Party Advisory
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html Third Party Advisory
http://www.securityfocus.com/bid/90864 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1036348 Third Party Advisory VDB Entry
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.404722 Exploit Mailing List Third Party Advisory
http://www.ubuntu.com/usn/USN-2994-1 Third Party Advisory
http://xmlsoft.org/news.html Release Notes Vendor Advisory
https://access.redhat.com/errata/RHSA-2016:1292 Third Party Advisory
https://git.gnome.org/browse/libxml2/commit/?id=00906759053986b8079985644172085f74331f83 Patch Third Party Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05194709 Third Party Advisory
https://kc.mcafee.com/corporate/index?page=content&id=SB10170 Patch Third Party Advisory
https://support.apple.com/HT206899 Third Party Advisory
https://support.apple.com/HT206901 Third Party Advisory
https://support.apple.com/HT206902 Third Party Advisory
https://support.apple.com/HT206903 Third Party Advisory
https://support.apple.com/HT206904 Third Party Advisory
https://support.apple.com/HT206905 Third Party Advisory
https://www.debian.org/security/2016/dsa-3593 Third Party Advisory
https://www.tenable.com/security/tns-2016-18 Third Party Advisory
cvelogic Threat Intelligence