by Kastro
Paper/Archive/CVE-2026-119568

CVE-2026-119568

vsftpd vsftpd — vsftpd through 3.0.5 require_ssl_reuse Bypass via FTPS Data Channel Hijacking

CVSS 9.1
critical.is priorityof 100
27
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0No EPSS score.000 × 200.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

vsftpd through 3.0.5 contains an authentication bypass vulnerability in ssl_data_accept() that allows unauthenticated attackers to hijack FTPS data connections by resuming their own TLS session ticket. Attackers sharing the victim's source IP can obtain a ticket via AUTH TLS, then connect to the victim's PASV port to steal downloads or inject upload data.

Affected

ProductAffectedFixed inSource
vsftpd≤ 3.0.5–CNA

Scores by source

VulnCheck (CNA)9.1CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
VulnCheck (CNA)7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

writeupabraxaslabs.tech/research/vsftpd-ssl-data-any-ticketrefsecurity.appspot.com/vsftpd.htmlwriteupvulncheck.com/advisories/vsftpd-through-3.0.5-require-ssl-reuse-bypass-via-ftps-data-channel-hijacking