CVE-2019-9804

Name: CVE-2019-9804
Creator: NVD / NIST
Published: 2019-04-26T17:29:03.43+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.83%

Last modified Jun 17, 2026

CVE-2019-9804 is a vulnerability of currently unknown severity. In Firefox Developer Tools it is possible that pasting the result of the 'Copy as cURL' command into a command shell on macOS will cause the execution of unintended additional bash script commands if the URL was maliciously crafted. This is the result of an issue with the native version of Bash on macOS. EPSS estimates a 1.83% chance of exploitation in the next 30 days.

Description

In Firefox Developer Tools it is possible that pasting the result of the 'Copy as cURL' command into a command shell on macOS will cause the execution of unintended additional bash script commands if the URL was maliciously crafted. This is the result of an issue with the native version of Bash on macOS. *Note: This issue only affects macOS. Other operating systems are unaffected.*. This vulnerability affects Firefox < 66.

Metrics

EPSS Probability

1.83%

76.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 66.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1518026Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2019-07/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1518026Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2019-07/Vendor Advisory

Timeline

Published: Apr 26, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-9804?

How severe is CVE-2019-9804?

Severity scoring for CVE-2019-9804 is pending analysis. The EPSS model estimates a 1.83% probability of exploitation in the next 30 days.

How do I fix CVE-2019-9804?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-9804?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST