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Vulnerability record · CVE-2019-9894 · published 21 March 2019

CVE-2019-9894: Putty vulnerability

Putty · Putty

A remotely triggerable memory overwrite in RSA key exchange in PuTTY before 0.71 can occur before host key verification.

7.5 CVSS 3.0 High EPSS 2.4% · top 16.3% CWE-320 · CWE-320
7.5CVSS 3.0 base score, v2 6.4
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

Description

A remotely triggerable memory overwrite in RSA key exchange in PuTTY before 0.71 can occur before host key verification.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00004.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00020.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/04/msg00023.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36LWQ3NPFIV7DC7TC4KFPRY
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LDO3F267P347E6U2IILFCYW
https://seclists.org/bugtraq/2019/Apr/6 Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20190404-0001/ PatchThird Party Advisory
https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html Third Party Advisory
https://www.debian.org/security/2019/dsa-4423 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00004.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00020.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/04/msg00023.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36LWQ3NPFIV7DC7TC4KFPRY
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LDO3F267P347E6U2IILFCYW
https://seclists.org/bugtraq/2019/Apr/6 Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20190404-0001/ PatchThird Party Advisory
https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html Third Party Advisory
https://www.debian.org/security/2019/dsa-4423 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-9894), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.