MEDIUM
CVE-2016-1833
CWE-125Published: May 20, 2016· Updated: Jun 17, 2026
5.5
CVSS v3.1
Official Description
The htmlCurrentChar function in libxml2 before 2.9.4, as used in Apple iOS before 9.3.2, OS X before 10.11.5, tvOS before 9.2.1, and watchOS before 2.2.1, allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted XML document.
Technical Analysis
CVE-2016-1833 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Affected Vendors & Products
Apple4 product(s)
iphone osmac os xtvoswatchos
Canonical1 product(s)
ubuntu linux
Debian1 product(s)
debian linux
mcafee1 product(s)
web gateway
Red Hat6 product(s)
enterprise linux desktopenterprise linux serverenterprise linux server ausenterprise linux server eusenterprise linux server tusenterprise linux workstation
xmlsoft1 product(s)
libxml2
Source: NVD CPE · 29 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
ADVISORYhttp://xmlsoft.org/news.html
ADVISORYhttp://xmlsoft.org/news.html
All References (46)
→
http://lists.apple.com/archives/security-announce/2016/May/msg00001.htmlMailing List · Vendor Advisory
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http://lists.apple.com/archives/security-announce/2016/May/msg00002.htmlMailing List · Vendor Advisory
→
http://lists.apple.com/archives/security-announce/2016/May/msg00003.htmlMailing List · Vendor Advisory
→
http://lists.apple.com/archives/security-announce/2016/May/msg00004.htmlMailing List · Vendor Advisory
→
http://rhn.redhat.com/errata/RHSA-2016-2957.htmlThird Party Advisory
→
http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.htmlThird Party Advisory
→
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.htmlPatch · Third Party Advisory
→
→
http://www.securityfocus.com/bid/90691Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1035890Third Party Advisory · VDB Entry
→
http://www.ubuntu.com/usn/USN-2994-1Third Party Advisory
→
http://xmlsoft.org/news.htmlRelease Notes · Vendor Advisory
→
https://access.redhat.com/errata/RHSA-2016:1292Third Party Advisory
→
https://bugs.chromium.org/p/project-zero/issues/detail?id=636Exploit · Mailing List · Third Party Advisory
→
https://bugzilla.gnome.org/show_bug.cgi?id=758606Exploit · Issue Tracking · Third Party Advisory
Quick Facts
CVE IDCVE-2016-1833
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-125
CISA KEVNo
Affected6 vendor(s)
PublishedMay 20, 2016
Related CVEs (CWE-125)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2016-1833 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.