CVE-2020-1730

Libssh vulnerability

CVSS

5.3

EPSS

3.1%

EPSS pct

86th

Exploited

No known

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.

Affected vendor

Libssh

Affected product

Libssh

CVSS vector

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

Weakness type (CWE)

CWE-476 — NULL Pointer Dereference

Published

2020-04-13

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to low impact to availability.

Its EPSS score of 3.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 86% of all scored CVEs.

Check your external exposure to CVE-2020-1730

Confirm whether Libssh Libssh is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2020-1730.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-1730

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