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-2011-2523 unimportant priority: Debian including 1 source packages (vsftpd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.
vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.