CVE-2021-28963 Code injection in n/a

What is CVE-2021-28963?

CVE-2021-28963 is a medium-severity code injection vulnerability in Debian Debian Linux, published on 22 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Shibboleth Service Provider before 3.2.1 allows content injection because template generation uses attacker-controlled parameters.

Weakness: CWE-74

Which versions are affected by CVE-2021-28963?

It affects 2 products.

Products include Debian Debian Linux, Shibboleth Service Provider.

How do I fix CVE-2021-28963?

Upgrade to a fixed version.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2021-28963 being exploited?

There is no known exploitation of CVE-2021-28963 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-2021-28963, DLA-2599-1, DSA-4872-1, GHSA-6jjj-9g6r-j2vh, UBUNTU-CVE-2021-28963, USN-4925-1.