CVE catalog
CVE-2020-16135
libssh: CVE-2020-16135
- Severity
- Medium · CVSS 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 4.11% · Oct 25, 2026
libssh 0.9.4 has a NULL pointer dereference in tftpserver.c if ssh_buffer_new returns NULL.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libssh | sid | 0.12.2-1 | fixed |
| Debian | libssh | forky | 0.12.2-1 | fixed |
| Debian | libssh | trixie | 0.11.5-0+deb13u1 | fixed |
| Debian | libssh | trixie-security | 0.11.5-0+deb13u1 | fixed |
| Debian | libssh | bookworm | 0.10.6-0+deb12u2 | fixed |
| Debian | libssh | bookworm-security | 0.10.6-0+deb12u3 | fixed |
| Alpine | libssh | 3.10 | 0.8.9-r1 | fixed |
| Alpine | libssh | 3.11 | 0.9.4-r1 | fixed |
| Alpine | libssh | 3.9 | 0.7.6-r3 | fixed |
| Ubuntu | libssh | 16.04 | 0.6.3-3ubuntu3 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.1 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.2 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.2ubuntu1 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.3 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.3ubuntu0.1 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.3ubuntu0.2 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.3ubuntu0.5 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.3ubuntu0.6 | fixed |
| Ubuntu | libssh | 18.04 | 0.7.5-1 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1build1 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.1 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.2 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.5 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.6 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.7 | fixed |
| Ubuntu | libssh | 20.04 | 0.9.0-1ubuntu1 | vulnerable |
| Ubuntu | libssh | 20.04 | 0.9.0-1ubuntu4 | vulnerable |
| Ubuntu | libssh | 20.04 | 0.9.0-1ubuntu5 | vulnerable |
| Ubuntu | libssh | 20.04 | 0.9.3-2ubuntu1 | vulnerable |
| Ubuntu | libssh | 20.04 | 0.9.3-2ubuntu2 | vulnerable |
| Ubuntu | libssh | 20.04 | 0.9.3-2ubuntu2.1 | fixed |
| Ubuntu | libssh | 16.04 | 0.6.3-3ubuntu3 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.1 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.2 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.2ubuntu1 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.3 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.3ubuntu0.1 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.3ubuntu0.2 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.3ubuntu0.5 | vulnerable |
| Ubuntu | libssh | 16.04 | 0.6.3-4.3ubuntu0.6 | fixed |
| Ubuntu | libssh | 18.04 | 0.7.5-1 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1build1 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.1 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.2 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.5 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.6 | vulnerable |
| Ubuntu | libssh | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.7 | fixed |
| Ubuntu | libssh | 20.04 | 0.9.0-1ubuntu1 | vulnerable |
| Ubuntu | libssh | 20.04 | 0.9.0-1ubuntu4 | vulnerable |
| Ubuntu | libssh | 20.04 | 0.9.0-1ubuntu5 | vulnerable |
| Ubuntu | libssh | 20.04 | 0.9.3-2ubuntu1 | vulnerable |
| Ubuntu | libssh | 20.04 | 0.9.3-2ubuntu2 | vulnerable |
| Ubuntu | libssh | 20.04 | 0.9.3-2ubuntu2.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libssh | source | sid | 0.9.5-1 | not yet assigned | Not reported | [966560] |
| Debian | libssh | source | forky | 0.9.5-1 | not yet assigned | Not reported | [966560] |
| Debian | libssh | source | trixie | 0.9.5-1 | not yet assigned | Not reported | [966560] |
| Debian | libssh | source | bookworm | 0.9.5-1 | not yet assigned | Not reported | [966560] |
| Alpine | libssh | apk | 3.10 | 0.8.9-r1 | Not reported | ALPINE-CVE-2020-16135 | Not reported |
| Alpine | libssh | apk | 3.11 | 0.9.4-r1 | Not reported | ALPINE-CVE-2020-16135 | Not reported |
| Alpine | libssh | apk | 3.9 | 0.7.6-r3 | Not reported | ALPINE-CVE-2020-16135 | Not reported |
| Ubuntu | libssh | deb | 16.04 | 0.6.3-4.3ubuntu0.6 | Not reported | UBUNTU-CVE-2020-16135 | Not reported |
| Ubuntu | libssh | deb | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.7 | Not reported | UBUNTU-CVE-2020-16135 | Not reported |
| Ubuntu | libssh | deb | 20.04 | 0.9.3-2ubuntu2.1 | Not reported | UBUNTU-CVE-2020-16135 | Not reported |
| Ubuntu | libssh | deb | 16.04 | 0.6.3-4.3ubuntu0.6 | Not reported | USN-4447-1 | Not reported |
| Ubuntu | libssh | deb | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.7 | Not reported | USN-4447-1 | Not reported |
| Ubuntu | libssh | deb | 20.04 | 0.9.3-2ubuntu2.1 | Not reported | USN-4447-1 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [libssh-4]Unknown
Source package: [libssh]
Details (4)
0.10.6-0+deb12u2· amd64 · bookwormFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u2· arm64 · bookwormFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· amd64 · bookworm-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· arm64 · bookworm-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
- [libssh-dev]Unknown
Source package: [libssh]
Details (4)
0.10.6-0+deb12u2· amd64 · bookwormFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u2· arm64 · bookwormFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· amd64 · bookworm-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· arm64 · bookworm-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
- [libssh-doc]Unknown
Source package: [libssh]
Details (4)
0.10.6-0+deb12u2· all · bookwormFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u2· all · bookwormFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· all · bookworm-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· all · bookworm-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
- [libssh-gcrypt-4]Unknown
Source package: [libssh]
Details (4)
0.10.6-0+deb12u2· amd64 · bookwormFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u2· arm64 · bookwormFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· amd64 · bookworm-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· arm64 · bookworm-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
- [libssh-gcrypt-dev]Unknown
Source package: [libssh]
Details (4)
0.10.6-0+deb12u2· amd64 · bookwormFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u2· arm64 · bookwormFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· amd64 · bookworm-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· arm64 · bookworm-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
[Debian 13 (Trixie)]
- [libssh-4]Unknown
Source package: [libssh]
Details (4)
0.11.2-1+deb13u1· amd64 · trixieFixed · Fixed:
0.9.5-1dsa · libssh · debian · 13
0.11.2-1+deb13u1· arm64 · trixieFixed · Fixed:
0.9.5-1dsa · libssh · debian · 13
0.11.5-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · 13
0.11.5-0+deb13u1· arm64 · trixie-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · 13
- [libssh-dev]Unknown
Source package: [libssh]
Details (4)
0.11.2-1+deb13u1· amd64 · trixieFixed · Fixed:
0.9.5-1dsa · libssh · debian · 13
0.11.2-1+deb13u1· arm64 · trixieFixed · Fixed:
0.9.5-1dsa · libssh · debian · 13
0.11.5-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · 13
0.11.5-0+deb13u1· arm64 · trixie-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · 13
- [libssh-doc]Unknown
Source package: [libssh]
Details (4)
0.11.2-1+deb13u1· all · trixieFixed · Fixed:
0.9.5-1dsa · libssh · debian · 13
0.11.2-1+deb13u1· all · trixieFixed · Fixed:
0.9.5-1dsa · libssh · debian · 13
0.11.5-0+deb13u1· all · trixie-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · 13
0.11.5-0+deb13u1· all · trixie-securityFixed · Fixed:
0.9.5-1dsa · libssh · debian · 13
Observed:
References
- [https://access.redhat.com/errata/RHSA-2021:4387]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2021_4387.json]
- [https://osv.dev/vulnerability/ALPINE-CVE-2020-16135]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2020-16135]
- [https://osv.dev/vulnerability/DLA-2303-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2020-16135]
- [https://osv.dev/vulnerability/USN-4447-1]
- [https://security-tracker.debian.org/tracker/CVE-2020-16135]
- [https://wid.cert-bund.de/.well-known/csaf/white/2020/wid-sec-w-2024-0438.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]