HIGH
CVE-2016-6128
CWE-20Published: August 7, 2016· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official Description
The gdImageCropThreshold function in gd_crop.c in the GD Graphics Library (aka libgd) before 2.2.3, as used in PHP before 7.0.9, allows remote attackers to cause a denial of service (application crash) via an invalid color index.
Technical Analysis
CVE-2016-6128 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 availability disruption (denial of service), with a CVSS base score of 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
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
All References (26)
→
http://lists.opensuse.org/opensuse-updates/2016-08/msg00086.htmlMailing List · Third Party Advisory
→
http://lists.opensuse.org/opensuse-updates/2016-09/msg00078.htmlMailing List · Third Party Advisory
→
http://rhn.redhat.com/errata/RHSA-2016-2750.htmlThird Party Advisory
→
http://www.debian.org/security/2016/dsa-3619Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2016/06/30/1Mailing List · Third Party Advisory
→
http://www.securityfocus.com/bid/91509Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1036276Third Party Advisory · VDB Entry
→
http://www.ubuntu.com/usn/USN-3030-1Third Party Advisory
→
https://bugs.php.net/72494Issue Tracking · Permissions Required
→
https://github.com/libgd/libgd/commit/1ccfe21e14c4d18336f9da8515cd17db88c3de61Issue Tracking · Patch · Third Party Advisory
→
https://github.com/libgd/libgd/commit/6ff72ae40c7c20ece939afb362d98cc37f4a1c96Issue Tracking · Third Party Advisory
→
https://libgd.github.io/release-2.2.3.htmlRelease Notes · Third Party Advisory
→
https://security.gentoo.org/glsa/201612-09Third Party Advisory
→
http://lists.opensuse.org/opensuse-updates/2016-08/msg00086.htmlMailing List · Third Party Advisory
→
http://lists.opensuse.org/opensuse-updates/2016-09/msg00078.htmlMailing List · Third Party Advisory
Quick Facts
CVE IDCVE-2016-6128
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-20
CISA KEVNo
Affected5 vendor(s)
PublishedAug 7, 2016
Related CVEs (CWE-20)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2016-6128 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.