What’s Vulnerable › Vulnerabilities

CVE-2019-17067

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-10-01 · updated 2026-06-17
• Weakness: CWE-770

Description

PuTTY before 0.73 on Windows improperly opens port-forwarding listening sockets, which allows attackers to listen on the same port to steal an incoming connection.

Affected products

• PuTTY: before 0.73 — fixed in 0.73

How to fix

Upgrade to a fixed version: PuTTY 0.73. Check the vendor advisory for mitigations.

References

• https://lists.tartarus.org/pipermail/putty-announce/2019/000029.html
• https://security.netapp.com/advisory/ntap-20191127-0003/
• https://lists.tartarus.org/pipermail/putty-announce/2019/000029.html
• https://security.netapp.com/advisory/ntap-20191127-0003/

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