CVE-2020-16135

Name: CVE-2020-16135
Creator: NVD / NIST
Published: 2020-07-29T21:15:13.507+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 4.11%

Last modified Jun 17, 2026

CVE-2020-16135 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. libssh 0.9.4 has a NULL pointer dereference in tftpserver.c if ssh_buffer_new returns NULL.. EPSS estimates a 4.11% chance of exploitation in the next 30 days.

Description

libssh 0.9.4 has a NULL pointer dereference in tftpserver.c if ssh_buffer_new returns NULL.

Metrics

CVSS 3.1

5.9/10

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

EPSS Probability

4.11%

89.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Libssh	Libssh	0.9.4
Debian	Debian Linux	9.0
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	20.04
Oracle	Communications Cloud Native Core Policy	1.15.0

References

https://bugs.libssh.org/T232Issue Tracking, Vendor Advisory
https://bugs.libssh.org/rLIBSSHe631ebb3e2247dd25e9678e6827c20dc73b73238Exploit, Issue Tracking, Vendor Advisory
https://gitlab.com/libssh/libssh-mirror/-/merge_requests/120Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00034.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCIKQRKXAAB4HMWM62EPZJ4DVBHIIEG6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JNW5GBC6JFN76VEWQXMLT5F7VCZ5AJ2E/
https://security.gentoo.org/glsa/202011-05Third Party Advisory
https://usn.ubuntu.com/4447-1/Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
https://bugs.libssh.org/T232Issue Tracking, Vendor Advisory
https://bugs.libssh.org/rLIBSSHe631ebb3e2247dd25e9678e6827c20dc73b73238Exploit, Issue Tracking, Vendor Advisory
https://gitlab.com/libssh/libssh-mirror/-/merge_requests/120Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00034.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCIKQRKXAAB4HMWM62EPZJ4DVBHIIEG6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JNW5GBC6JFN76VEWQXMLT5F7VCZ5AJ2E/
https://security.gentoo.org/glsa/202011-05Third Party Advisory
https://usn.ubuntu.com/4447-1/Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory

Timeline

Published: Jul 29, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-16135?

libssh 0.9.4 has a NULL pointer dereference in tftpserver.c if ssh_buffer_new returns NULL.

How severe is CVE-2020-16135?

CVE-2020-16135 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 4.11% probability of exploitation in the next 30 days.

How do I fix CVE-2020-16135?

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-2020-16135?

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

Scan your code now

Source: NVD / NIST