CVE-2021-38502

Description

Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could perform a downgrade attack to intercept transmitted messages, or could take control of the authenticated session to execute SMTP commands chosen by the MITM. If an unprotected authentication method was configured, the MITM could obtain the authentication credentials, too. This vulnerability affects Thunderbird < 91.2.

5.9

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.46%

Vendor Advisory debian.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Thunderbird

References

Link	Tags
https://www.mozilla.org/security/advisories/mfsa2021-47/	vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1733366	permissions required issue tracking vendor advisory
https://www.debian.org/security/2022/dsa-5034	issue tracking third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html	third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2021-38502?: CVE-2021-38502 has been scored as a medium severity vulnerability.
How to fix CVE-2021-38502?: To fix CVE-2021-38502, 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-2021-38502 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-38502 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-2021-38502?: CVE-2021-38502 affects Mozilla Thunderbird.

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