Integer overflow in PuTTY 0.62 and earlier, WinSCP before 5.1.6, and other products that use PuTTY allows remote SSH servers to cause a denial of service (crash) and possibly execute arbitrary code in certain applications that use PuTTY via a negative size value in an RSA key signature during the SSH handshake, which triggers a heap-based buffer overflow.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade filezillaUpgrade putty | Jul 30, 2024 | Aug 19, 2013 |
| Freebsd | — | Upgrade putty | Dec 10, 2025 | Aug 7, 2013 |
| Gentoo Linux | — | Upgrade net-misc/putty.Upgrade net-ftp/filezilla. | Oct 30, 2017 | Aug 19, 2013 |
| Suse | — | Upgrade puttyUpgrade filezilla-langUpgrade filezilla | Dec 12, 2013 | Aug 19, 2013 |
| Ubuntu | — | Upgrade putty | Nov 19, 2024 | Aug 19, 2013 |
| Winscp | — | Upgrade WinSCP to the latest version | Sep 11, 2025 | Aug 19, 2013 |
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