CVE-2020-8021 unauthorized read access to files where sourceaccess is disabled via a crafted _service file in Open Build Service

What is CVE-2020-8021?

CVE-2020-8021 is a medium-severity missing authorization vulnerability in Debian Debian Linux, published on 19 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

a Improper Access Control vulnerability in of Open Build Service allows remote attackers to read files of an OBS package where the sourceaccess/access is disabled This issue affects: Open Build Service versions prior to 2.10.5.

Weakness: CWE-269

Which versions are affected by CVE-2020-8021?

It affects 2 products.

Products include Debian Debian Linux, Opensuse Open Build Service.

How do I fix CVE-2020-8021?

Upgrade to a fixed version.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2020-8021 being exploited?

There is no known exploitation of CVE-2020-8021 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-2020-8021, GHSA-4635-6x6c-c5r7, UBUNTU-CVE-2020-8021.