Cleartext storage of sensitive information in Mozilla Thunderbird
Priority LOW 31CWE-312Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Partial Red Hat: 8 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-312.
Summary
If a user saved passwords before Thunderbird 60 and then later set a master password, an unencrypted copy of these passwords is still accessible. This is because the older stored password file was not deleted when the data was copied to a new format starting in Thunderbird 60. The new master password is added only on the new file. This could allow the exposure of stored password data outside of user expectations. This vulnerability affects Thunderbird < 68.5.
Why it matters now
EPSS 0.01016 63rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Thunderbird (Mozilla): 68.5Red Hat: 4 advisoriesRed Hat: 8 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 | Thunderbird | before 68.5 | 68.5 | Patch available | CNA |
- Thunderbird VendorMozilla Affected before 68.5 Fixed in 68.5 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* | before 68.5.0 | 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:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 68.5.0 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
Remediation
- Fix · CNA Thunderbird (Mozilla) Fixed in 68.5
Red Hat 4 advisories
- RHSA-2020:0576 Released 2020-02-24 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-68.5.0-1.el7_7
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-68.5.0-1.el7_7
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-68.5.0-1.el7_7
- RHSA-2020:0574 Released 2020-02-24 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Desktop (v. 6) thunderbird-68.5.0-1.el6_10
- Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-68.5.0-1.el6_10
- Red Hat Enterprise Linux Workstation (v. 6) thunderbird-68.5.0-1.el6_10
- RHSA-2020:0577 Released 2020-02-24 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream (v. 8) thunderbird-68.5.0-1.el8_1
Show 1 more Red Hat advisories
- RHSA-2020:0565 Released 2020-02-20 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.0) thunderbird-68.5.0-1.el8_0
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Mozilla Thunderbird 68.5
5 records Highest priority Priority LOW 5 LOW
Other records, highest priority first
- TI-2020-05503 Use of uninitialized resource in Mozilla ThunderbirdPriority LOW 32
- TI-2020-05505 NULL pointer dereference in Mozilla ThunderbirdPriority LOW 31
- TI-2020-05507 Improper input validation in Mozilla ThunderbirdPriority LOW 23
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-2020:0577 |
| Red Hat Enterprise Linux AppStream E4S (v. 8.0) | Fixed | RHSA-2020:0565 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2020:0576 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2020:0574 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2020:0574 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2020:0576 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2020:0574 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2020:0576 |
Timeline
- 2026-10-02 Threatist record created from CVE-2020-6794
- 2026-10-03 Alias added: GHSA-2v3r-qqr5-3x33
References
More Mozilla Thunderbird 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-2020-6794 · CVE Program
- CVE-2020-6794 · NVD
- FIRST EPSS
- GHSA-2v3r-qqr5-3x33 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-6794 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences