CVE-2020-12397

Description

By encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender email address that Thunderbird displays. This vulnerability affects Thunderbird < 68.8.0.

Category

4.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.18%
Vendor Advisory ubuntu.com Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: Mozilla Thunderbird
Published at:
Updated at:

References

Link Tags
https://www.mozilla.org/security/advisories/mfsa2020-18/ vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1617370 issue tracking patch vendor advisory
https://usn.ubuntu.com/4373-1/ third party advisory vendor advisory
https://security.gentoo.org/glsa/202005-03 third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-12397?
CVE-2020-12397 has been scored as a medium severity vulnerability.
How to fix CVE-2020-12397?
To fix CVE-2020-12397, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-12397 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-12397 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-12397?
CVE-2020-12397 affects Mozilla Thunderbird.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.