CVE-2020-26970
Publication date 9 December 2020
Last updated 25 August 2025
Ubuntu priority
Description
When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird < 78.5.1.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| thunderbird | ||
| 22.04 LTS jammy |
Fixed 1:78.5.1+build1-0ubuntu1
|
|
| 20.04 LTS focal |
Fixed 1:78.7.1+build1-0ubuntu0.20.04.1
|
|
| 18.04 LTS bionic |
Fixed 1:78.8.1+build1-0ubuntu0.18.04.1
|
|
| 16.04 LTS xenial | Ignored end of standard support, was needs-triage | |
| 14.04 LTS trusty | Not in release |
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
8.8 · High
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-4701-1
- Thunderbird vulnerabilities
- 20 January 2021