CVE-2020-1730

Name: CVE-2020-1730
Creator: NVD / NIST
Published: 2020-04-13T19:15:11.173+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 3.06%

Last modified Jun 17, 2026

CVE-2020-1730 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A flaw was found in libssh versions before 0.8.9 and before 0.9.4 in the way it handled AES-CTR (or DES ciphers if enabled) ciphers. The server or client could crash when the connection hasn't been fully initialized and the system tries to cleanup the ciphers when closing the connection. EPSS estimates a 3.06% chance of exploitation in the next 30 days.

Description

A flaw was found in libssh versions before 0.8.9 and before 0.9.4 in the way it handled AES-CTR (or DES ciphers if enabled) ciphers. The server or client could crash when the connection hasn't been fully initialized and the system tries to cleanup the ciphers when closing the connection. The biggest threat from this vulnerability is system availability.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

3.06%

85.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Libssh	Libssh	>= 0.8.0, < 0.8.9
Libssh	Libssh	>= 0.9.0, < 0.9.4
Netapp	Cloud Backup	All versions
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	19.10
Fedoraproject	Fedora	31
Fedoraproject	Fedora	32
Redhat	Enterprise Linux	8.0
Oracle	Mysql Workbench	<= 8.0.21

References

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1730Issue Tracking, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2A7BIFKUYIYKTY7FX4BEWVC2OHS5DPOU/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLSWHBQ3EPKGTGLQNH554Z746BJ3C554/
https://security.netapp.com/advisory/ntap-20200424-0001/Third Party Advisory
https://usn.ubuntu.com/4327-1/Third Party Advisory
https://www.libssh.org/security/advisories/CVE-2020-1730.txtVendor Advisory
https://www.oracle.com/security-alerts/cpuoct2020.htmlPatch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1730Issue Tracking, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2A7BIFKUYIYKTY7FX4BEWVC2OHS5DPOU/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLSWHBQ3EPKGTGLQNH554Z746BJ3C554/
https://security.netapp.com/advisory/ntap-20200424-0001/Third Party Advisory
https://usn.ubuntu.com/4327-1/Third Party Advisory
https://www.libssh.org/security/advisories/CVE-2020-1730.txtVendor Advisory
https://www.oracle.com/security-alerts/cpuoct2020.htmlPatch, Third Party Advisory

Timeline

Published: Apr 13, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-1730?

How severe is CVE-2020-1730?

CVE-2020-1730 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 3.06% probability of exploitation in the next 30 days.

How do I fix CVE-2020-1730?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-1730?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST