common/session.c in Claws Mail before 3.17.6 has a protocol violation because
suffix data after STARTTLS is mishandled (CVE-2020-15917).
- https://bugs.mageia.org/show_bug.cgi?id=27040
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/G7UX65342HRVDQML4G4GEVEUB764EUM5/
- https://www.cve.org/CVERecord?id=CVE-2020-15917
- 7/core/claws-mail-3.17.6-1.mga7
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