CVE-2021-39371

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-23 · updated 2026-06-17
Weakness: CWE-611

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.

Affected products

Debian Linux: 9.0
geopython OWSLib: 0.24.1
OSGeo Pywps: before 4.4.5 — fixed in 4.4.5

How to fix

Upgrade to a fixed version: OSGeo Pywps 4.4.5. Check the vendor advisory for mitigations.

References

https://github.com/geopython/OWSLib/issues/790
https://github.com/geopython/pywps/pull/616
https://lists.debian.org/debian-lts-announce/2021/09/msg00001.html
https://github.com/geopython/OWSLib/issues/790
https://github.com/geopython/pywps/pull/616
https://lists.debian.org/debian-lts-announce/2021/09/msg00001.html

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