CVE catalog
CVE-2020-1730
libssh: CVE-2020-1730
- Severity
- Medium · CVSS 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 3.14% · Oct 25, 2026
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.
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-r0 | fixed |
| Alpine | libssh | 3.11 | 0.9.4-r0 | fixed |
| Alpine | libssh | 3.9 | 0.7.6-r3 | 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 | 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 | fixed |
| Opensuse | libssh | tumbleweed | 0.9.6-2.1 | fixed |
| Opensuse | libssh | leap 15.1 | 0.8.7-lp151.2.12.1 | fixed |
| Suse | libssh | linux enterprise software development kit 12 sp5 | 0.8.7-3.9.1 | fixed |
| Suse | libssh | linux enterprise server 12 sp5 | 0.8.7-3.9.1 | fixed |
| Suse | libssh | linux enterprise server for sap applications 12 sp5 | 0.8.7-3.9.1 | fixed |
| Suse | libssh | linux enterprise module for basesystem 15 sp1 | 0.8.7-10.12.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libssh | source | sid | 0.9.4-1 | not yet assigned | Not reported | [956308] |
| Debian | libssh | source | forky | 0.9.4-1 | not yet assigned | Not reported | [956308] |
| Debian | libssh | source | trixie | 0.9.4-1 | not yet assigned | Not reported | [956308] |
| Debian | libssh | source | bookworm | 0.9.4-1 | not yet assigned | Not reported | [956308] |
| Alpine | libssh | apk | 3.10 | 0.8.9-r0 | Not reported | ALPINE-CVE-2020-1730 | Not reported |
| Alpine | libssh | apk | 3.11 | 0.9.4-r0 | Not reported | ALPINE-CVE-2020-1730 | Not reported |
| Alpine | libssh | apk | 3.9 | 0.7.6-r3 | Not reported | ALPINE-CVE-2020-1730 | Not reported |
| Ubuntu | libssh | deb | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.6 | Not reported | UBUNTU-CVE-2020-1730 | Not reported |
| Ubuntu | libssh | deb | 18.04 | 0.8.0~20170825.94fa1e38-1ubuntu0.6 | Not reported | USN-4327-1 | Not reported |
| Opensuse | libssh | rpm | tumbleweed | 0.9.6-2.1 | Not reported | OPENSUSE-SU-2024:11603-1 | Not reported |
| Opensuse | libssh | rpm | leap 15.1 | 0.8.7-lp151.2.12.1 | Not reported | OPENSUSE-SU-2020:0510-1 | Not reported |
| Suse | libssh | rpm | linux enterprise software development kit 12 sp5 | 0.8.7-3.9.1 | Not reported | SUSE-SU-2020:0968-1 | Not reported |
| Suse | libssh | rpm | linux enterprise server 12 sp5 | 0.8.7-3.9.1 | Not reported | SUSE-SU-2020:0968-1 | Not reported |
| Suse | libssh | rpm | linux enterprise server for sap applications 12 sp5 | 0.8.7-3.9.1 | Not reported | SUSE-SU-2020:0968-1 | Not reported |
| Suse | libssh | rpm | linux enterprise module for basesystem 15 sp1 | 0.8.7-10.12.1 | Not reported | SUSE-SU-2020:0967-1 | 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:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u2· arm64 · bookwormFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· amd64 · bookworm-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· arm64 · bookworm-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
- [libssh-dev]Unknown
Source package: [libssh]
Details (4)
0.10.6-0+deb12u2· amd64 · bookwormFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u2· arm64 · bookwormFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· amd64 · bookworm-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· arm64 · bookworm-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
- [libssh-doc]Unknown
Source package: [libssh]
Details (4)
0.10.6-0+deb12u2· all · bookwormFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u2· all · bookwormFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· all · bookworm-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· all · bookworm-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
- [libssh-gcrypt-4]Unknown
Source package: [libssh]
Details (4)
0.10.6-0+deb12u2· amd64 · bookwormFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u2· arm64 · bookwormFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· amd64 · bookworm-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· arm64 · bookworm-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
- [libssh-gcrypt-dev]Unknown
Source package: [libssh]
Details (4)
0.10.6-0+deb12u2· amd64 · bookwormFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u2· arm64 · bookwormFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· amd64 · bookworm-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · bookworm; dsa · libssh · debian · 12
0.10.6-0+deb12u1· arm64 · bookworm-securityFixed · Fixed:
0.9.4-1dsa · 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:
0.9.4-1dsa · libssh · debian · 13
0.11.2-1+deb13u1· arm64 · trixieFixed · Fixed:
0.9.4-1dsa · libssh · debian · 13
0.11.5-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · 13
0.11.5-0+deb13u1· arm64 · trixie-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · 13
- [libssh-dev]Unknown
Source package: [libssh]
Details (4)
0.11.2-1+deb13u1· amd64 · trixieFixed · Fixed:
0.9.4-1dsa · libssh · debian · 13
0.11.2-1+deb13u1· arm64 · trixieFixed · Fixed:
0.9.4-1dsa · libssh · debian · 13
0.11.5-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · 13
0.11.5-0+deb13u1· arm64 · trixie-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · 13
- [libssh-doc]Unknown
Source package: [libssh]
Details (4)
0.11.2-1+deb13u1· all · trixieFixed · Fixed:
0.9.4-1dsa · libssh · debian · 13
0.11.2-1+deb13u1· all · trixieFixed · Fixed:
0.9.4-1dsa · libssh · debian · 13
0.11.5-0+deb13u1· all · trixie-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · 13
0.11.5-0+deb13u1· all · trixie-securityFixed · Fixed:
0.9.4-1dsa · libssh · debian · 13
[openSUSE Tumbleweed]
- [libssh4]Unknown
Source package: [libssh]
Details (1)
0.11.5-2.1· x86_64 · tumbleweedUnknown · Fixed:
0.9.6-2.1Version impact unknown
dsa · libssh · opensuse · tumbleweed
- [libssh4-32bit]Unknown
Source package: [libssh]
Details (1)
0.11.5-2.1· x86_64 · tumbleweedUnknown · Fixed:
0.9.6-2.1Version impact unknown
dsa · libssh · opensuse · tumbleweed
- [libssh-config]Unknown
Source package: [libssh]
Details (1)
0.11.5-2.1· noarch · tumbleweedUnknown · Fixed:
0.9.6-2.1Version impact unknown
dsa · libssh · opensuse · tumbleweed
- [libssh-devel]Unknown
Source package: [libssh]
Details (1)
0.11.5-2.1· x86_64 · tumbleweedUnknown · Fixed:
0.9.6-2.1Version impact unknown
dsa · libssh · opensuse · tumbleweed
Observed:
References
- [https://access.redhat.com/errata/RHSA-2020:5218]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2020_4545.json]
- [https://osv.dev/vulnerability/ALPINE-CVE-2020-1730]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2020-1730]
- [https://osv.dev/vulnerability/SUSE-SU-2020:0967-1]
- [https://osv.dev/vulnerability/SUSE-SU-2020:0968-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2020-1730]
- [https://osv.dev/vulnerability/USN-4327-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2020:0510-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2024:11603-1]
- [https://security-tracker.debian.org/tracker/CVE-2020-1730]
- [https://wid.cert-bund.de/.well-known/csaf/white/2021/wid-sec-w-2025-0227.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]