CVE-2020-19143 Memory corruption in n/a

What is CVE-2020-19143?

CVE-2020-19143 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 9 Sep 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Buffer Overflow in LibTiff v4.0.10 allows attackers to cause a denial of service via the "TIFFVGetField" funtion in the component 'libtiff/tif_dir.c'.

Weakness: CWE-787

Which versions are affected by CVE-2020-19143?

It affects 2 products.

Products include Debian Debian Linux, Simplesystems Libtiff.

How do I fix CVE-2020-19143?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2020-19143 being exploited?

There is no known exploitation of CVE-2020-19143 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2020-19143, DSA-4997-1, GHSA-qpx8-2vr9-wqjr, JLSEC-2026-482, UBUNTU-CVE-2020-19143, USN-5084-1.