Use of uninitialized resource in Mozilla Thunderbird
Priority LOW 23CWE-908Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · 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-908 and the CVSS impact.
Summary
When deriving an identifier for an email message, uninitialized memory was used in addition to the message contents. This vulnerability affects Thunderbird < 68.5.
Why it matters now
EPSS 0.01332 71st percentileScored 2026-11-07
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-2020-05504 Cleartext storage of sensitive information in Mozilla ThunderbirdPriority LOW 31
Vendor assessments
Red Hat
Red Hat rating: Low. 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-2020-6792
- 2026-10-03 Alias added: GHSA-c3mf-x864-vg86
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-2020-6792 · CVE Program
- CVE-2020-6792 · NVD
- FIRST EPSS
- GHSA-c3mf-x864-vg86 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-6792 · 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