CVE-2020-21598 Memory corruption in n/a

What is CVE-2020-21598?

CVE-2020-21598 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 16 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

libde265 v1.0.4 contains a heap buffer overflow in the ff_hevc_put_unweighted_pred_8_sse function, which can be exploited via a crafted a file.

Weakness: CWE-787

Which versions are affected by CVE-2020-21598?

It affects 2 products.

Products include Debian Debian Linux, Struktur Libde265.

How do I fix CVE-2020-21598?

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-2020-21598 being exploited?

There is no known exploitation of CVE-2020-21598 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 ALPINE-CVE-2020-21598, DEBIAN-CVE-2020-21598, GHSA-6pjv-42cj-6wjv, UBUNTU-CVE-2020-21598.