CVE-2016-9556

The IsPixelGray function in MagickCore/pixel-accessor.h in ImageMagick 7.0.3-8 allows remote attackers to cause a denial of service (out-of-bounds heap read) via a crafted image file.

Published: 2017-03-23 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-9556 is rated Moderate Risk (52.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.28%). EPSS rose +1.98% over the last day, indicating growing attacker interest. Review affected assets and schedule 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-2016-9556

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 2026-06-15 0.30% 2.28% +1.98%
2 2026-01-21 0.23% 0.30% +0.07%
3 2025-06-25 — 0.23% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-9556

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.0 MEDIUM
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
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.
 1.8 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/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:M)
Exploitation needs some favorable conditions, but not exceptional ones.
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.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2016-9556

OS Trackers for CVE-2016-9556

vendor priority summary link
debian not yet assigned CVE-2016-9556 not yet assigned priority: Debian including 1 source packages (imagemagick), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-9556
redhat low — https://access.redhat.com/security/cve/CVE-2016-9556
suse medium CVE-2016-9556 severity moderate: SUSE including 40 source package names (GraphicsMagick-1.2.5-4.59.1, ImageMagick-6.4.3.6-7.60.1, …), 108 product×package rows across 30 product lines (SUSE Linux Enterprise Desktop 12 SP1, SUSE Linux Enterprise Desktop 12 SP2, … (30 product lines)): Fixed 108. https://www.suse.com/security/cve/CVE-2016-9556/
ubuntu low CVE-2016-9556 low priority: Ubuntu including 1 source packages (imagemagick), 5 status rows across 5 suites (precise, trusty, upstream, xenial, yakkety): released 4, needed 1. https://ubuntu.com/security/CVE-2016-9556

Affected software / configurations for CVE-2016-9556

Vendor Product Version Raw CPE
imagemagick imagemagick 7.0.3-8 cpe:2.3:a:imagemagick:imagemagick:7.0.3-8:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
opensuse_project leap 42.1 cpe:2.3:o:opensuse_project:leap:42.1:*:*:*:*:*:*:*

References for CVE-2016-9556

URL Tags
http://lists.opensuse.org/opensuse-updates/2016-12/msg00040.html Third Party Advisory
http://www.debian.org/security/2016/dsa-3726 Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/11/23/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/12/01/4 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/12/02/12 Mailing List Third Party Advisory
http://www.securityfocus.com/bid/94492 Third Party Advisory VDB Entry
https://blogs.gentoo.org/ago/2016/11/19/imagemagick-heap-based-buffer-overflow-in-ispixelgray-pixel-accessor-h Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1398198 Issue Tracking Third Party Advisory
https://github.com/ImageMagick/ImageMagick/commit/ce98a7acbcfca7f0a178f4b1e7b957e419e0cc99 Issue Tracking Patch Vendor Advisory
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