Path traversal in Mozilla Firefox ESR
Priority LOW 25CWE-22Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Partial Red Hat: 16 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-22 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.00347 28th percentileScored 2026-11-07
Fix Partial Firefox ESR (Mozilla): 68.8Firefox (Mozilla): 76+1 more productRed Hat: 10 advisoriesRed Hat: 16 fixed, 1 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mozilla | Firefox ESR | before 68.8 | 68.8 | Patch available | CNA |
| Mozilla | Firefox | before 76 | 76 | Patch available | CNA |
| Mozilla | Thunderbird | before 68.8.0 | 68.8.0 | Patch available | CNA |
- Firefox ESR VendorMozilla Affected before 68.8 Fixed in 68.8 Patch available CNA
- Firefox VendorMozilla Affected before 76 Fixed in 76 Patch available CNA
- Thunderbird VendorMozilla Affected before 68.8.0 Fixed in 68.8.0 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | before 76.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* | before 68.8.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* | before 68.8.0 | Vulnerable | Mozilla |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* | 16.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 18.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* | 19.10 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* | 20.04 | Vulnerable | Canonical |
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 76.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 68.8.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 68.8.0 Vulnerable ·Mozilla
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* Versions 16.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* Versions 19.10 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* Versions 20.04 Vulnerable ·Canonical
Remediation
- Fix · CNA Firefox ESR (Mozilla) Fixed in 68.8
- Fix · CNA Firefox (Mozilla) Fixed in 76
- Fix · CNA Thunderbird (Mozilla) Fixed in 68.8.0
Red Hat 10 advisories
- RHSA-2020:2050 Released 2020-05-11 · Red Hat rating Criticalthunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-68.8.0-1.el7_8
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-68.8.0-1.el7_8
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-68.8.0-1.el7_8
- RHSA-2020:2049 Released 2020-05-11 · Red Hat rating Criticalthunderbird security update
- Red Hat Enterprise Linux Desktop (v. 6) thunderbird-68.8.0-1.el6_10
- Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-68.8.0-1.el6_10
- Red Hat Enterprise Linux Workstation (v. 6) thunderbird-68.8.0-1.el6_10
- RHSA-2020:2046 Released 2020-05-11 · Red Hat rating Criticalthunderbird security update
- Red Hat Enterprise Linux AppStream (v. 8) thunderbird-68.8.0-1.el8_2
Show 7 more Red Hat advisories
- RHSA-2020:2047 Released 2020-05-11 · Red Hat rating Criticalthunderbird security update
- Red Hat Enterprise Linux AppStream EUS (v. 8.1) thunderbird-68.8.0-1.el8_1
- RHSA-2020:2048 Released 2020-05-11 · Red Hat rating Criticalthunderbird security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.0) thunderbird-68.8.0-1.el8_0
- RHSA-2020:2036 Released 2020-05-06 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux Desktop (v. 6) firefox-68.8.0-1.el6_10
- Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-68.8.0-1.el6_10
- Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-68.8.0-1.el6_10
- Red Hat Enterprise Linux Server (v. 6) firefox-68.8.0-1.el6_10
- Red Hat Enterprise Linux Server Optional (v. 6) firefox-68.8.0-1.el6_10
- Red Hat Enterprise Linux Workstation (v. 6) firefox-68.8.0-1.el6_10
- Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-68.8.0-1.el6_10
- RHSA-2020:2037 Released 2020-05-06 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux Client (v. 7) firefox-68.8.0-1.el7_8
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-68.8.0-1.el7_8
- Red Hat Enterprise Linux Server (v. 7) firefox-68.8.0-1.el7_8
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-68.8.0-1.el7_8
- Red Hat Enterprise Linux Workstation (v. 7) firefox-68.8.0-1.el7_8
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-68.8.0-1.el7_8
- RHSA-2020:2031 Released 2020-05-06 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream (v. 8) firefox-68.8.0-1.el8_2
- RHSA-2020:2032 Released 2020-05-06 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream EUS (v. 8.1) firefox-68.8.0-1.el8_1
- RHSA-2020:2033 Released 2020-05-06 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.0) firefox-68.8.0-1.el8_0
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — USN-4373-1
5 records Highest priority Priority MEDIUM 2 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2020-05540 Out-of-bounds write in Mozilla Firefox ESRPriority MEDIUM 51
- TI-2020-09913 Out-of-bounds write in Mozilla Firefox ESRPriority MEDIUM 47
- TI-2020-09905 Race condition in Mozilla Firefox ESRPriority LOW 38
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2020:2031, RHSA-2020:2046 |
| Red Hat Enterprise Linux AppStream E4S (v. 8.0) | Fixed | RHSA-2020:2033, RHSA-2020:2048 |
| Red Hat Enterprise Linux AppStream EUS (v. 8.1) | Fixed | RHSA-2020:2032, RHSA-2020:2047 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2020:2037, RHSA-2020:2050 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2020:2037 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2020:2036, RHSA-2020:2049 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2020:2036 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2020:2036 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2020:2036 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2020:2037 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2020:2036, RHSA-2020:2049 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2020:2037, RHSA-2020:2050 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2020:2036, RHSA-2020:2049 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2020:2037, RHSA-2020:2050 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2020:2036 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2020:2037 |
Timeline
- 2026-10-02 Threatist record created from CVE-2020-12392
- 2026-10-03 Alias added: GHSA-f75r-qhf4-x3wr
References
Advisory 6
More Mozilla Firefox vulnerabilities
- TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
- TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
- TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
- TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
- TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
- TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2020-12392 · CVE Program
- CVE-2020-12392 · NVD
- FIRST EPSS
- GHSA-f75r-qhf4-x3wr · GitHub Advisory Database · CC BY 4.0
- CVE-2020-12392 · Red Hat security data · CC BY 4.0
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