What is CVE-2016-9933?

CVE-2016-9933 is a high-severity vulnerability in Libgd, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2017-01-04.

How severe is CVE-2016-9933?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2016-9933 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Libgd

CVE-2016-9933

Stack consumption vulnerability in the gdImageFillToBorder function in gd.c in the GD Graphics Library (aka libgd) before 2.2.2, as used in PHP before 5.6.28 and 7.x before 7.0.13, allows remote attackers to cause a denial of service (segmentation violation) via a crafted imagefilltoborder call that triggers use of a negative color value.

Vulnerability class: Buffer Overflow

Published 2017-01-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.069 (93.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.069 · newest: 0.069 · change: 0.000

Affected products

Libgd — versions 2.2.1
PHP — versions 7.0.0, 7.0.1, 7.0.2

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

www.openwall.com/lists/oss-security/2016/12/12/2 (mailing-list, Third Party Advisory)
lists.opensuse.org/opensuse-updates/2016-12/msg00133.html (vendor-advisory)
lists.opensuse.org/opensuse-updates/2017-01/msg00054.html (vendor-advisory)
www.php.net/ChangeLog-7.php (Release Notes, Vendor Advisory)
lists.opensuse.org/opensuse-updates/2017-01/msg00002.html (vendor-advisory)
github.com/php/php-src/commit/863d37ea66d5c960db08d6f4a2cbd2518f0f80d1 (Vendor Advisory)
www.debian.org/security/2017/dsa-3751 (vendor-advisory)
www.securityfocus.com/bid/94865 (vdb-entry)
access.redhat.com/errata/RHSA-2018:1296 (vendor-advisory)
www.php.net/ChangeLog-5.php (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2016-9933?: CVE-2016-9933 is a high-severity vulnerability in Libgd, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2017-01-04.
How severe is CVE-2016-9933?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2016-9933 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.