CVE-2019-17019

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-01-08 · updated 2026-06-17

Description

When Python was installed on Windows, a python file being served with the MIME type of text/plain could be executed by Python instead of being opened as a text file when the Open option was selected upon download. *Note: this issue only occurs on Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox < 72.

Affected products

Mozilla Firefox: before 72.0 — fixed in 72.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 72.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1568003
https://www.mozilla.org/security/advisories/mfsa2020-01/
https://bugzilla.mozilla.org/show_bug.cgi?id=1568003
https://www.mozilla.org/security/advisories/mfsa2020-01/

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