CVE-2017-16938
A global buffer overflow in OptiPNG 0.7.6 allows remote attackers to cause a denial-of-service attack or other unspecified impact with a maliciously crafted GIF format file, related to an uncontrolled loop in the LZWReadByte function of the gifread.c…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.86%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A global buffer overflow in OptiPNG 0.7.6 allows remote attackers to cause a denial-of-service attack or other unspecified impact with a maliciously crafted GIF format file, related to an uncontrolled loop in the LZWReadByte function of the gifread.c file.
- CVSS 3.0
- 7.8 HIGHCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 1.86% probability · 79th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- optipng project/optipng
- Source
- cve@mitre.org
EPSS moved from 3.0% on 21 September 2026 to 1.9% on 27 October 2026.
References
- https://lists.debian.org/debian-lts-announce/2017/11/msg00042.html
- https://security.gentoo.org/glsa/201801-02
- https://sourceforge.net/p/optipng/bugs/69/Patch, Third Party Advisory
- https://www.debian.org/security/2017/dsa-4058
- https://lists.debian.org/debian-lts-announce/2017/11/msg00042.html
- https://security.gentoo.org/glsa/201801-02
- https://sourceforge.net/p/optipng/bugs/69/Patch, Third Party Advisory
- https://www.debian.org/security/2017/dsa-4058
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.