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Vulnerability record · CVE-2020-16135 · published 29 July 2020

CVE-2020-16135: Libssh null pointer dereference vulnerability

Libssh · Libssh

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

5.9 CVSS 3.1 Medium EPSS 4.1% · top 9.6% CWE-476 · NULL pointer dereference
5.9CVSS 3.1 base score, v2 4.3
4.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
18References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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

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

Affected products

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

References

LinkTags
https://bugs.libssh.org/T232 Issue TrackingVendor Advisory
https://bugs.libssh.org/rLIBSSHe631ebb3e2247dd25e9678e6827c20dc73b73238 ExploitIssue TrackingVendor Advisory
https://gitlab.com/libssh/libssh-mirror/-/merge_requests/120 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00034.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCIKQRKXAAB4HMWM62EPZJ4
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JNW5GBC6JFN76VEWQXMLT5F
https://security.gentoo.org/glsa/202011-05 Third Party Advisory
https://usn.ubuntu.com/4447-1/ Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://bugs.libssh.org/T232 Issue TrackingVendor Advisory
https://bugs.libssh.org/rLIBSSHe631ebb3e2247dd25e9678e6827c20dc73b73238 ExploitIssue TrackingVendor Advisory
https://gitlab.com/libssh/libssh-mirror/-/merge_requests/120 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00034.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCIKQRKXAAB4HMWM62EPZJ4
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JNW5GBC6JFN76VEWQXMLT5F
https://security.gentoo.org/glsa/202011-05 Third Party Advisory
https://usn.ubuntu.com/4447-1/ Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-16135), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.