critical9.8
CVE-2026-67191
Xlight FTP Server before 3.9.5 contains a pre-authentication heap buffer overflow vulnerability that allows remote unauthenticated attackers to write past the …
Impact
Xlight FTP Server before 3.9.5 contains a pre-authentication heap buffer overflow vulnerability that allows remote unauthenticated attackers to write past the end of a heap buffer by sending a malformed SSH client identification string. A logic error in the recv loop's termination condition uses an incorrect OR operator where an AND operator is required, enabling exploitation on any SSH or SFTP connection before authentication occurs.
Affected products
| Product | Affected versions |
|---|---|
| Xlight FTP Server | before 3.9.5 |
Versions were read from the advisory text. No structured product data has been published for this record yet.