CVE-2016-4607

libxslt in Apple iOS before 9.3.3, OS X before 10.11.6, iTunes before 12.4.2 on Windows, iCloud before 5.2.1 on Windows, tvOS before 9.2.2, and watchOS before 2.2.2 allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via unknown vectors, a different vulnerability than CVE-2016-4608, CVE-2016-4609, CVE-2016-4610, and CVE-2016-4612.

Published: 2016-07-22 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-4607 is rated High Risk (74.9/100): CVSS Critical severity, with high exploitation likelihood (EPSS 6.83%, 91th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +3.76% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2016-4607

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 2026-04-20 3.06% 6.83% +3.76%
2 2026-01-21 4.74% 3.06% -1.68%
3 2025-08-08 — 4.74% —

Full EPSS history (19 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-4607

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/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:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2016-4607

OS Trackers for CVE-2016-4607

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2016-4607
ubuntu medium CVE-2016-4607 medium priority: Ubuntu including 1 source packages (libxslt), 7 status rows across 7 suites (precise, trusty, upstream, wily, xenial, yakkety, zesty): released 4, not-affected 2, ignored 1. https://ubuntu.com/security/CVE-2016-4607

Affected software / configurations for CVE-2016-4607

Vendor Product Version Raw CPE
xmlsoft libxslt < 1.1.29 cpe:2.3:a:xmlsoft:libxslt:*:*:*:*:*:*:*:*
apple iphone_os < 9.3.3 cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple mac_os_x < 10.11.6 cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
apple tvos < 9.2.2 cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
apple watchos < 2.2.2 cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
apple icloud < 5.2.1 cpe:2.3:a:apple:icloud:*:*:*:*:*:*:*:*
apple itunes < 12.4.2 cpe:2.3:a:apple:itunes:*:*:*:*:*:*:*:*
fedoraproject fedora 30 cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*

References for CVE-2016-4607

URL Tags
http://lists.apple.com/archives/security-announce/2016/Jul/msg00000.html Mailing List Vendor Advisory
http://lists.apple.com/archives/security-announce/2016/Jul/msg00001.html Mailing List Vendor Advisory
http://lists.apple.com/archives/security-announce/2016/Jul/msg00002.html Mailing List Vendor Advisory
http://lists.apple.com/archives/security-announce/2016/Jul/msg00003.html Mailing List Vendor Advisory
http://lists.apple.com/archives/security-announce/2016/Jul/msg00005.html Mailing List Vendor Advisory
http://www.securityfocus.com/bid/91834 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1036348 Third Party Advisory VDB Entry
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SK4YNISS22MJY22YX5I6V2U63QZAUEHA/
https://support.apple.com/HT206899 Vendor Advisory
https://support.apple.com/HT206901 Vendor Advisory
https://support.apple.com/HT206902 Vendor Advisory
https://support.apple.com/HT206903 Vendor Advisory
https://support.apple.com/HT206904 Vendor Advisory
https://support.apple.com/HT206905 Vendor Advisory
cvelogic Threat Intelligence