CVE-2020-1730 (GCVE-0-2020-1730)

Vulnerability from cvelistv5 – Published: 2020-04-13 00:00 – Updated: 2024-08-04 06:46
VLAI
Summary
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.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE
Assigner
References
Impacted products
Vendor Product Version
Red Hat libssh Affected: libssh versions before 0.8.9
Affected: libssh versions before 0.9.4
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    "redhat_vex": {
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      "current_release_date": "2025-11-21T14:58:33+00:00",
      "cve": "CVE-2020-1730",
      "id": "CVE-2020-1730",
      "initial_release_date": "2020-04-09T09:00:00+00:00",
      "product_status:fixed": "46",
      "product_status:known_not_affected": "20",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "libssh: denial of service when handling AES-CTR (or DES) ciphers",
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-25T17:56:16Z",
      "cve": "CVE-2020-1730",
      "id": "CVE-2020-1730",
      "initial_release_date": "2023-02-15T04:04:24Z",
      "product_status:known_affected": "320",
      "product_status:known_not_affected": "79",
      "product_status:recommended": "326",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2020-1730",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-1730.json",
      "version": "43"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.