What is CVE-2019-9894?

CVE-2019-9894 is a high-severity software vulnerability (CWE-320) with a CVSS score of 7.5. A remotely triggerable memory overwrite in RSA key exchange in PuTTY before 0.71 can occur before host key verification.

Is CVE-2019-9894 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 2%.

What products does CVE-2019-9894 affect?

Tracked products affected include Fedora. Check the version you run to see whether it is affected.

How do I fix CVE-2019-9894?

Apply the vendor fix promptly. An official patch or advisory is available. Upgrade affected products to a fixed version.

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CVE-2019-9894

HIGH severity · CVSS 7.5 · CWE-320

7.5CVSS HIGH

Summary

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

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

Confidentiality impactNone

Integrity impactHigh

Availability impactNone

Exploit probability (EPSS)2%

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

Affected products we track (1)

Fedora

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://security.netapp.com/advisory/ntap-20190404-0001/ ↗

Additional information

NVD record
https://security.netapp.com/advisory/ntap-20190404-0001/Patch
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00004.htmlAdvisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00020.htmlAdvisory
https://lists.debian.org/debian-lts-announce/2019/04/msg00023.htmlAdvisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36LWQ3NPFIV7DC7TC4KFPRYRH2OR7SZ2/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LDO3F267P347E6U2IILFCYW7JPTLCCES/
https://seclists.org/bugtraq/2019/Apr/6Advisory
https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.htmlAdvisory