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CVE-2020-1730 libssh

Affected softwarelibssh
Severity5.3 Medium CVSS 3.1 3 scores
WeaknessCWE-476
Published13 Apr 2020
Updated17 Jun 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 6 years ago.
  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 3.1% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

5.3 MEDIUM v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 5.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L secalert@redhat.com Secondary published
CVSS 3.1 5.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L NVD Primary
CVSS 2.0 5.0 none AV:N/AC:L/Au:N/C:N/I:N/A:P NVD Primary

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update October 2020 ↗ CPU 2020-Q4 Oracle MySQL / MySQL Workbench (libssh) (8.0.21 and prior)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle MySQL MySQL Workbench (libssh) 8.0.21 and prior

Products and versions

6 products, 9 version entries
SourceVendorProductSchemeAffected versions
nvd canonical ubuntu linux generic 18.04 · 19.10
nvd fedoraproject fedora generic 31 · 32
nvd libssh libssh generic ≥ 0.8.0 and ＜ 0.8.9 · ≥ 0.9.0 and ＜ 0.9.4
nvd netapp cloud backup generic any version
nvd oracle mysql workbench generic ≤ 8.0.21
nvd redhat enterprise linux generic 8.0

Earlier manual review

A reviewer classified this CVE in an older dataset. We kept the labels and products below, but not the reviewer's reasoning.

## Manual Classification Context **Labels:** MYSQL WORKBENCH (LIBSSH), MYSQL WORKBENCH, NO AUTH REMOTE EXPLOIT **Products:** MYSQL WORKBENCH, LIBSSH, ORACLE MYSQL

References

URLTags
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1730 Issue 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.txt Vendor Advisory
https://www.oracle.com/security-alerts/cpuoct2020.html Patch, Third Party Advisory

Timeline
Published2020-04-13By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.