CVE-2020-12393
The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP method of a...
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. Note: this issue only affects Firefox on Windows operating systems.. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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. Note: this issue only affects Firefox on Windows operating systems.. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
- Record
CVE-2020-12393- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 4.6 Medium
AV:L/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-78
- Updated
- 2026-11-02
CVE List No score
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. Note: this issue only affects Firefox on Windows operating systems.. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
- Record
CVE-2020-12393- Updated
- 2026-11-02
EUVDEUVD-2020-4705 No score
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. Note: this issue only affects Firefox on Windows operating systems.. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
- Record
EUVD-2020-4705- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-x932-mvm6-79m8 No score
The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP method of a...
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. Note: this issue only affects Firefox on Windows operating systems.. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
- Record
GHSA-x932-mvm6-79m8- Weakness
- CWE-74
- Updated
- 2026-11-02
OSVALPINE-CVE-2020-12393
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. Note: this issue only affects Firefox on Windows operating systems.. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
- Record
ALPINE-CVE-2020-12393- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
OSVUBUNTU-CVE-2020-12393
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. Note: this issue only affects Firefox on Windows operating systems.. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
- Record
UBUNTU-CVE-2020-12393- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Show 9 moreShow less
OSVopenSUSE-SU-2020:0621-1 No score
Security update for MozillaFirefox
This update for MozillaFirefox fixes the following issues:
Update to version 68.8.0 ESR (bsc#1171186):
- CVE-2020-12387: Use-after-free during worker shutdown
- CVE-2020-12388: Sandbox escape with improperly guarded Access Tokens
- CVE-2020-12389: Sandbox escape with improperly separated process types
- CVE-2020-6831: Buffer overflow in SCTP chunk input validation
- CVE-2020-12392: Arbitrary local file access with 'Copy as cURL'
- CVE-2020-12393: Devtools' 'Copy as cURL' feature did not fully escape website-controlled data, potentially leading to command injection
- CVE-2020-12395: Memory safety bugs fixed in Firefox 76 and Firefox ESR 68.8
This update was imported from the SUSE:SLE-15:Update update project.
- Record
openSUSE-SU-2020:0621-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2020:0643-1 No score
Security update for MozillaThunderbird
This update for MozillaThunderbird fixes the following issues:
- Update to 68.8.0 ESR
MFSA 2020-18 (bsc#1171186)
- CVE-2020-12397 (bmo#1617370) Sender Email Address Spoofing using encoded Unicode characters
- CVE-2020-12387 (bmo#1545345) Use-after-free during worker shutdown
- CVE-2020-6831 (bmo#1632241) Buffer overflow in SCTP chunk input validation
- CVE-2020-12392 (bmo#1614468) Arbitrary local file access with 'Copy as cURL'
- CVE-2020-12393 (bmo#1615471) Devtools' 'Copy as cURL' feature did not fully escape website-controlled data, potentially leading to command injection
- CVE-2020-12395 (bmo#1595886, bmo#1611482, bmo#1614704, bmo#1624098, bmo#1625749, bmo#1626382, bmo#1628076, bmo#1631508) Memory safety bugs fixed in Thunderbird 68.8.0
This update was imported from the SUSE:SLE-15:Update update project.
- Record
openSUSE-SU-2020:0643-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:10600-1 No score
MozillaFirefox-92.0-1.2 on GA media
These are all security issues fixed in the MozillaFirefox-92.0-1.2 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:10600-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:10601-1 No score
MozillaThunderbird-91.1.1-1.1 on GA media
These are all security issues fixed in the MozillaThunderbird-91.1.1-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:10601-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:14572-1 No score
firefox-esr-128.5.1-1.1 on GA media
These are all security issues fixed in the firefox-esr-128.5.1-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:14572-1- Updated
- 2026-11-02
OSVSUSE-SU-2020:1209-1 No score
Security update for MozillaFirefox
This update for MozillaFirefox fixes the following issues:
Update to version 68.8.0 ESR (bsc#1171186):
- CVE-2020-12387: Use-after-free during worker shutdown
- CVE-2020-12388: Sandbox escape with improperly guarded Access Tokens
- CVE-2020-12389: Sandbox escape with improperly separated process types
- CVE-2020-6831: Buffer overflow in SCTP chunk input validation
- CVE-2020-12392: Arbitrary local file access with 'Copy as cURL'
- CVE-2020-12393: Devtools' 'Copy as cURL' feature did not fully escape website-controlled data, potentially leading to command injection
- CVE-2020-12395: Memory safety bugs fixed in Firefox 76 and Firefox ESR 68.8
- Record
SUSE-SU-2020:1209-1- Updated
- 2026-11-02
OSVSUSE-SU-2020:1218-1 No score
Security update for MozillaFirefox
This update for MozillaFirefox fixes the following issues:
Update to version 68.8.0 ESR (bsc#1171186):
- CVE-2020-12387: Use-after-free during worker shutdown
- CVE-2020-12388: Sandbox escape with improperly guarded Access Tokens
- CVE-2020-12389: Sandbox escape with improperly separated process types
- CVE-2020-6831: Buffer overflow in SCTP chunk input validation
- CVE-2020-12392: Arbitrary local file access with 'Copy as cURL'
- CVE-2020-12393: Devtools' 'Copy as cURL' feature did not fully escape website-controlled data, potentially leading to command injection
- CVE-2020-12395: Memory safety bugs fixed in Firefox 76 and Firefox ESR 68.8
- Record
SUSE-SU-2020:1218-1- Updated
- 2026-11-02
OSVSUSE-SU-2020:1225-1 No score
Security update for MozillaThunderbird
This update for MozillaThunderbird fixes the following issues:
- Update to 68.8.0 ESR
MFSA 2020-18 (bsc#1171186)
- CVE-2020-12397 (bmo#1617370) Sender Email Address Spoofing using encoded Unicode characters
- CVE-2020-12387 (bmo#1545345) Use-after-free during worker shutdown
- CVE-2020-6831 (bmo#1632241) Buffer overflow in SCTP chunk input validation
- CVE-2020-12392 (bmo#1614468) Arbitrary local file access with 'Copy as cURL'
- CVE-2020-12393 (bmo#1615471) Devtools' 'Copy as cURL' feature did not fully escape website-controlled data, potentially leading to command injection
- CVE-2020-12395 (bmo#1595886, bmo#1611482, bmo#1614704, bmo#1624098, bmo#1625749, bmo#1626382, bmo#1628076, bmo#1631508) Memory safety bugs fixed in Thunderbird 68.8.0
- Record
SUSE-SU-2020:1225-1- Updated
- 2026-11-02
OSVSUSE-SU-2020:14359-1 No score
Security update for MozillaFirefox
This update for MozillaFirefox fixes the following issues:
-
Firefox Extended Support Release 68.8.0 ESR MFSA 2020-17 (bsc#1171186)
- CVE-2020-12387 (bmo#1545345) Use-after-free during worker shutdown
- CVE-2020-12388 (bmo#1618911) Sandbox escape with improperly guarded Access Tokens
- CVE-2020-12389 (bmo#1554110) Sandbox escape with improperly separated process types
- CVE-2020-6831 (bmo#1632241) Buffer overflow in SCTP chunk input validation
- CVE-2020-12392 (bmo#1614468) Arbitrary local file access with 'Copy as cURL'
- CVE-2020-12393 (bmo#1615471) Devtools' 'Copy as cURL' feature did not fully escape website-controlled data, potentially leading to command injection
- CVE-2020-12395 (bmo#1595886, bmo#1611482, bmo#1614704, bmo#1624098, bmo#1625749, bmo#1626382, bmo#1628076, bmo#1631508) Memory safety bugs fixed in Firefox 76 and Firefox ESR 68.8
-
Since firefox-gcc8 now has disabled autoreqprov for firefox-libstdc++6 and firefox-libgcc_s1, those packages don't provide some capabilities, we have to disable AutoReqProv in MozillaFirefox too so they're not added as automatic requirements. (bsc#1162828)
- Record
SUSE-SU-2020:14359-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
firefoxAlpine:v3.12 |
before 76.0-r0 | 76.0-r0 |
firefoxAlpine:v3.13 |
before 76.0-r0 | 76.0-r0 |
firefoxAlpine:v3.14 |
before 76.0-r0 | 76.0-r0 |
firefoxAlpine:v3.15 |
before 76.0-r0 | 76.0-r0 |
firefoxAlpine:v3.16 |
before 76.0-r0 | 76.0-r0 |
firefoxAlpine:v3.17 |
before 76.0-r0 | 76.0-r0 |
firefoxAlpine:v3.18 |
before 76.0-r0 | 76.0-r0 |
firefoxAlpine:v3.19 |
before 76.0-r0 | 76.0-r0 |
firefoxAlpine:v3.20 |
before 76.0-r0 | 76.0-r0 |
firefoxAlpine:v3.21 |
before 76.0-r0 | 76.0-r0 |
Show 59 moreShow less
| Package | Affected | Fixed |
|---|---|---|
firefoxAlpine:v3.22 |
before 76.0-r0 | 76.0-r0 |
firefoxAlpine:v3.23 |
before 76.0-r0 | 76.0-r0 |
firefox-esrAlpine:v3.11 |
before 68.8.0-r0 | 68.8.0-r0 |
firefox-esrAlpine:v3.12 |
before 68.8.0-r0 | 68.8.0-r0 |
firefox-esrAlpine:v3.13 |
before 68.8.0-r0 | 68.8.0-r0 |
firefox-esrAlpine:v3.14 |
before 68.8.0-r0 | 68.8.0-r0 |
firefox-esrAlpine:v3.15 |
before 68.8.0-r0 | 68.8.0-r0 |
firefox-esrAlpine:v3.16 |
before 68.8.0-r0 | 68.8.0-r0 |
firefox-esrAlpine:v3.17 |
before 68.8.0-r0 | 68.8.0-r0 |
firefox-esrAlpine:v3.18 |
before 68.8.0-r0 | 68.8.0-r0 |
firefox-esrAlpine:v3.19 |
before 68.8.0-r0 | 68.8.0-r0 |
firefox-esrAlpine:v3.20 |
before 68.8.0-r0 | 68.8.0-r0 |
firefox-esrAlpine:v3.21 |
before 68.8.0-r0 | 68.8.0-r0 |
firefox-esrAlpine:v3.22 |
before 68.8.0-r0 | 68.8.0-r0 |
firefox-esrAlpine:v3.23 |
before 68.8.0-r0 | 68.8.0-r0 |
librewolfAlpine:v3.21 |
before 76.0-r0 | 76.0-r0 |
librewolfAlpine:v3.22 |
before 76.0-r0 | 76.0-r0 |
librewolfAlpine:v3.23 |
before 76.0-r0 | 76.0-r0 |
librewolfAlpine:v3.24 |
before 76.0-r0 | 76.0-r0 |
mozjs68Alpine:v3.12 |
before 68.8.0-r0 | 68.8.0-r0 |
thunderbirdAlpine:v3.16 |
before 68.8.0-r0 | 68.8.0-r0 |
thunderbirdAlpine:v3.17 |
before 68.8.0-r0 | 68.8.0-r0 |
thunderbirdAlpine:v3.18 |
before 68.8.0-r0 | 68.8.0-r0 |
thunderbirdAlpine:v3.19 |
before 68.8.0-r0 | 68.8.0-r0 |
thunderbirdAlpine:v3.20 |
before 68.8.0-r0 | 68.8.0-r0 |
thunderbirdAlpine:v3.21 |
before 68.8.0-r0 | 68.8.0-r0 |
thunderbirdAlpine:v3.22 |
before 68.8.0-r0 | 68.8.0-r0 |
thunderbirdAlpine:v3.23 |
before 68.8.0-r0 | 68.8.0-r0 |
MozillaFirefoxSUSE:Linux Enterprise Module for Desktop Applications 15 SP1 |
before 68.8.0-3.87.1 | 68.8.0-3.87.1 |
MozillaFirefoxSUSE:HPE Helion OpenStack 8 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:OpenStack Cloud 7 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:OpenStack Cloud 8 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:OpenStack Cloud Crowbar 8 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 12 SP1 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 12 SP2 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 12 SP3 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Software Development Kit 12 SP4 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Software Development Kit 12 SP5 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP1-LTSS |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP2-LTSS |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP2-BCL |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP3-LTSS |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP3-BCL |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP4 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 12 SP4 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP5 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 12 SP5 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaFirefoxSUSE:Enterprise Storage 5 |
before 68.8.0-109.119.1 | 68.8.0-109.119.1 |
MozillaThunderbirdSUSE:Linux Enterprise Workstation Extension 15 SP1 |
before 68.8.0-3.80.2 | 68.8.0-3.80.2 |
MozillaFirefoxSUSE:Linux Enterprise Server 11 SP4-LTSS |
before 68.8.0-78.73.1 | 68.8.0-78.73.1 |
mozjs52Ubuntu:18.04:LTS |
All versions, plus listed versions 52.3.1-0ubuntu352.3.1-7fakesync152.8.1-0ubuntu0.18.04.152.9.1-0ubuntu0.18.04.1 |
None known |
mozjs38Ubuntu:18.04:LTS |
All versions, plus listed versions 38.8.0~repack1-0ubuntu138.8.0~repack1-0ubuntu338.8.0~repack1-0ubuntu4 |
None known |
mozjs68Ubuntu:20.04:LTS |
All versions, plus listed versions 68.5.0-1~fakesync68.5.0-2~fakesync68.6.0-168.6.0-1ubuntu1 |
None known |
mozjs52Ubuntu:20.04:LTS |
All versions, plus listed versions 52.9.1-1build152.9.1-1ubuntu3 |
None known |
MozillaFirefoxopenSUSE:Leap 15.1 |
before 68.8.0-lp151.2.45.1 | 68.8.0-lp151.2.45.1 |
MozillaThunderbirdopenSUSE:Leap 15.1 |
before 68.8.0-lp151.2.38.2 | 68.8.0-lp151.2.38.2 |
MozillaFirefoxopenSUSE:Tumbleweed |
before 92.0-1.2 | 92.0-1.2 |
MozillaThunderbirdopenSUSE:Tumbleweed |
before 91.1.1-1.1 | 91.1.1-1.1 |
firefox-esropenSUSE:Tumbleweed |
before 128.5.1-1.1 | 128.5.1-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, aliases, references | OSV | |
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-12393 is a high vulnerability (CVSS 7.8) in Mozilla Firefox, published May 7, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.01%, the 63rd percentile. Fixed in firefox 76.0-r0.
References
mozilla.org/security/advisories/mfsa2020-18
bugzilla.mozilla.org/show_bug.cgi?id=1615471
nvd.nist.gov/vuln/detail/CVE-2020-12393
github.com/advisories/GHSA-x932-mvm6-79m8
Show 194 moreShow less
security.alpinelinux.org/vuln/CVE-2020-12393
suse.com/support/update/announcement/2020/suse-su-20201209-1
bugzilla.suse.com/1171186
ubuntu.com/security/CVE-2020-12393
cve.org/CVERecord?id=CVE-2020-12393
lists.opensuse.org/archives/list/[email protected]/thread/EHIK2CEXF7KGEAHF2CFW2EEKLTCAFFXT
Left out here: 1,770 references. The JSON record has them.