Buffer overflow in Mozilla Thunderbird
CVE-2020-26970
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.
Vulnerability class: Buffer Overflow
EPSS: 0.012 (65.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Mozilla Thunderbird — versions < 78.5.1
Weakness classification (CWE)
References
- security@mozilla.org (Permissions Required, x_refsource_MISC, Issue Tracking, Vendor Advisory)
- security@mozilla.org (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-26970?
- CVE-2020-26970 is a high-severity vulnerability in Mozilla Thunderbird, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2020-12-09.
- How severe is CVE-2020-26970?
- High severity. CVSS v3 base score is 8.8 out of 10.