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Vulnerability record · CVE-2019-17067 · published 1 October 2019

CVE-2019-17067: Putty allocation without limits vulnerability

Putty · Putty

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.

9.8 CVSS 3.1 Critical EPSS 1.6% · top 24.7% CWE-770 · Allocation without limits
9.8CVSS 3.1 base score, v2 7.5
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.tartarus.org/pipermail/putty-announce/2019/000029.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20191127-0003/
https://lists.tartarus.org/pipermail/putty-announce/2019/000029.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20191127-0003/

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2004-1008Putty vulnerabilityInteger signedness error in the ssh2_rdpkt function in PuTTY before 0.56 allows remote attackers to execute arbitrary code via a SSH2_MSG_DEBUG packe…EPSS 7.4%10.0CVE-2002-1357Cisco ios memory buffer overflow vulnerabilityMultiple SSH2 servers and clients do not properly handle packets or data elements with incorrect length specifiers, which may allow remote attackers …EPSS 9.8%10.0CVE-2002-1358Cisco ios improper input validation vulnerabilityMultiple SSH2 servers and clients do not properly handle lists with empty elements or strings, which may allow remote attackers to cause a denial of …EPSS 5.8%10.0CVE-2002-1359SSH2 implementations mishandle large packets, enabling DoS and possible code executionMultiple SSH2 servers and clients fail to properly handle large packets or large fields, leading to buffer overflow conditions. The flaw was demonstr…EPSS 80%analysed10.0CVE-2002-1360Cisco ios improper input validation vulnerabilityMultiple SSH2 servers and clients do not properly handle strings with null characters in them when the string length is specified by a length field, …EPSS 6.1%9.8CVE-2019-9895Putty memory buffer overflow vulnerabilityIn PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.EPSS 2.6%9.8CVE-2019-9898Putty vulnerabilityPotential recycling of random numbers used in cryptography exists within PuTTY before 0.71.EPSS 3.9%9.8CVE-2017-6542Putty memory buffer overflow vulnerabilityThe ssh_agent_channel_data function in PuTTY before 0.68 allows remote attackers to have unspecified impact via a large length value in an agent prot…EPSS 22%

Source: NIST National Vulnerability Database (record CVE-2019-17067), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.