CRITICAL
CVE-2016-9843
NVD-CWE-noinfoPublished: May 23, 2017· Updated: Jun 17, 2026
9.8
CVSS v3.1
Official Description
The crc32_big function in crc32.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact via vectors involving big-endian CRC calculation.
Technical Analysis
CVE-2016-9843 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Vendors & Products
Apple4 product(s)
iphone osmac os xtvoswatchos
Canonical1 product(s)
ubuntu linux
Debian1 product(s)
debian linux
mariadb1 product(s)
mariadb
netapp4 product(s)
active iq unified manageroncommand insightoncommand workflow automationsnapcenter
Node.js1 product(s)
node.js
openSUSE2 product(s)
leapopensuse
Oracle4 product(s)
database serverjdkjremysql
Red Hat5 product(s)
satelliteenterprise linux desktopenterprise linux eusenterprise linux serverenterprise linux workstation
zlib1 product(s)
zlib
Source: NVD CPE · 34 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.
All References (66)
Quick Facts
CVE IDCVE-2016-9843
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected10 vendor(s)
PublishedMay 23, 2017
Related CVEs (NVD-CWE-noinfo)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2016-9843 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. CVE data is provided under the NVD usage policy.