CVE-2020-12392

Name: CVE-2020-12392
Creator: NVD / NIST
Published: 2020-05-26T18:15:11.357+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.35%

Last modified Jun 17, 2026

CVE-2020-12392 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP POST data of a request, which can be controlled by the website. If a user used the 'Copy as cURL' feature and pasted the command into a terminal, it could have resulted in the disclosure of local files. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

Description

The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP POST data of a request, which can be controlled by the website. If a user used the 'Copy as cURL' feature and pasted the command into a terminal, it could have resulted in the disclosure of local files. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.35%

26.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 76.0
Mozilla	Firefox Esr	< 68.8.0
Mozilla	Thunderbird	< 68.8.0
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	19.10
Canonical	Ubuntu Linux	20.04

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1614468Issue Tracking, Permissions Required
https://security.gentoo.org/glsa/202005-03Third Party Advisory
https://security.gentoo.org/glsa/202005-04Third Party Advisory
https://usn.ubuntu.com/4373-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-16/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-17/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-18/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1614468Issue Tracking, Permissions Required
https://security.gentoo.org/glsa/202005-03Third Party Advisory
https://security.gentoo.org/glsa/202005-04Third Party Advisory
https://usn.ubuntu.com/4373-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-16/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-17/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-18/Vendor Advisory

Timeline

Published: May 26, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-12392?

How severe is CVE-2020-12392?

CVE-2020-12392 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.

How do I fix CVE-2020-12392?

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-2020-12392?

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

Scan your code now

Source: NVD / NIST