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HIGH

CVE-2020-6811

CVSS v3

8.8

HIGH

EPSS Score

3.3 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2020-6811 Red Hat Product Security115 products fixed · 2 known affected

    Mozilla: Devtools' 'Copy as cURL' feature did not fully escape website-controlled data, potentially leading to command injection

    firefox.src as a component of Red Hat Enterprise Linux 5 · thunderbird.src as a component of Red Hat Enterprise Linux 5

  • RHSA-2020:0914 Red Hat Product Security19 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2020:0919 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2020:0918 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2020:0905 Red Hat Product Security11 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2020:0820 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: firefox security update

3 more advisories

Full record on NVD

Description

The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP method 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 command injection and arbitrary command execution. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.

Technical details

Published
2020-03-25

Frequently asked questions

What is CVE-2020-6811?

The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP method 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 command injection and arbitrary command execution. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.

Is CVE-2020-6811 actively exploited?

Active exploitation of CVE-2020-6811 has not been confirmed. Its EPSS score was 3.3% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-6811?

CVE-2020-6811 has a CVSS v3 base score of 8.8 (HIGH severity).

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