Vulnerability · Published Dec 9, 2020 · Assigned by mozilla
CVE-2020-26970
High 8.8
In plain English
A high-severity security flaw in Thunderbird from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)8.8High
Exploit odds (30 days)1.2%top 30.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | thunderbird | 78.5.1-r0 | ALPINE-CVE-2020-26970 |
| Alpine:v3.21 | thunderbird | 78.5.1-r0 | ALPINE-CVE-2020-26970 |
| Alpine:v3.22 | thunderbird | 78.5.1-r0 | ALPINE-CVE-2020-26970 |
| Alpine:v3.23 | thunderbird | 78.5.1-r0 | ALPINE-CVE-2020-26970 |
| Debian:12 | thunderbird | 1:78.5.1-1 | DEBIAN-CVE-2020-26970 |
| Debian:13 | thunderbird | 1:78.5.1-1 | DEBIAN-CVE-2020-26970 |
| Debian:14 | thunderbird | 1:78.5.1-1 | DEBIAN-CVE-2020-26970 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | < 78.5.1 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1677338 x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-53/ x_refsource_CONFIRM