CVE-2021-39371 XML External Entity Injection in PyWPS

What is CVE-2021-39371?

CVE-2021-39371 is a high-severity vulnerability in Debian Debian Linux, published on 23 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An XML external entity (XXE) injection in PyWPS before 4.4.5 allows an attacker to view files on the application server filesystem by assigning a path to the entity. OWSLib 0.24.1 may also be affected.

Weakness: CWE-611

Which versions are affected by CVE-2021-39371?

3 open source packages ship an affected version, including pywps. It affects 3 products.

Products include Debian Debian Linux, Osgeo Owslib, Osgeo Pywps.

How do I fix CVE-2021-39371?

Upgrade pywps to 4.5.0 or later.

Is CVE-2021-39371 being exploited?

There is no known exploitation of CVE-2021-39371 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-2021-39371, DLA-2754-1, GHSA-p9wf-3xpg-c9g5, PYSEC-2021-121, UBUNTU-CVE-2021-39371.