CVE-2020-18768 Memory corruption in n/a
A heap buffer overflow in libtiff allows attackers to cause denial of service via crafted TIFF files, affecting applications using the library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-18768?
CVE-2020-18768 is a medium-severity memory corruption vulnerability in Libtiff Libtiff, published on 22 Aug 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which allows an attacker to cause a denial-of-service through a crafted tiff file.
Weakness: CWE-787
Which versions are affected by CVE-2020-18768?
It affects 1 product.
Products include Libtiff Libtiff.
How do I fix CVE-2020-18768?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-18768 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-18768 exists.
Other vulnerabilities in Libtiff Libtiff
Sources
Also known as AZL-43876, AZL-44271, DEBIAN-CVE-2020-18768, GHSA-mqcp-f5vw-2vmj, JLSEC-2025-309.