THREATPORT/VULNERABILITY/CVE-2019-3861
MEDIUM SEVERITY

CVE-2019-3861

Libssh2 vulnerability

CVSS
5.0
EPSS
5.1%
EPSS pct
92th
Exploited
No known
An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SSH packets with a padding length value greater than the packet length are parsed. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.
Affected vendor
Libssh2
Affected product
Libssh2
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Weakness type (CWE)
Published
2019-03-25

Risk analysis

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

Its EPSS score of 5.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 92% of all scored CVEs.

Check your external exposure to CVE-2019-3861

  • Confirm whether Libssh2 Libssh2 is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2019-3861.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-3861

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-3861 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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