Is CVE-2019-9804 actively exploited?

No active exploitation of CVE-2019-9804 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2019-9804 be exploited remotely?

Yes. CVE-2019-9804 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2019-9804?

CVE-2019-9804 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2019-9804

CWE-78Published: April 26, 2019· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2019-9804 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.