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CVE-2020-26970

8.8 · HIGH

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.

Published Dec 9, 2020CWE-787EPSS 1.25%

Overview

CVE-2020-26970 is a high-severity vulnerability. It was published on December 9, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugzilla.mozilla.org/show_bug.cgi?id=1677338Refwww.mozilla.org/security/advisories/mfsa2020-53/Refbugzilla.mozilla.org/show_bug.cgi?id=1677338Refwww.mozilla.org/security/advisories/mfsa2020-53/

How CyberStrike helps

Frequently asked questions

What is CVE-2020-26970?

CVE-2020-26970 is a high-severity vulnerability. It was published on December 9, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2020-26970?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-26970?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-26970?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-26970 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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