View at Official debian advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2015-3644 not yet assigned priority: Debian including 1 source packages (stunnel4), 3 status rows across 3 suites (bookworm, bullseye, trixie): resolved 3.
Stunnel 5.00 through 5.13, when using the redirect option, does not redirect client connections to the expected server after the initial connection, which allows remote attackers to bypass authentication.