CVE-2019-3855

Advisory lineage Upstream: 0 Downstream: 21
Modified
Published: 21 Mar 2019, 20:13
Last modified:17 Dec 2025, 21:40

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.3 HIGH
v2.0 (nvd)
EPSS Score
16.24% MEDIUM
16% probability +5.99%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

21 Mar 2019, 20:13
Published
Vulnerability first disclosed
17 Dec 2025, 21:40
Last Modified
Vulnerability information updated

Description

An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.

CVSS Metrics

  • v3.1•HIGH•Score: 8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  • v3.0•HIGH•Score: 7.5CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
  • v2.0•HIGH•Score: 9.3AV:N/AC:M/Au:N/C:C/I:C/A:C

EPSS Trends

Current EPSS score: 16.24%• Percentile: 95%

Techniques & Countermeasures

  • CWE-190•Integer Overflow or Wraparound

    The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • apple•xcode

    < 11.0

  • debian•debian_linux

    8.0 | 9.0

  • fedoraproject•fedora

    28 | 29 | 30

  • libssh2•libssh2

    < 1.8.1

  • netapp•ontap_select_deploy_administration_utility

    na

  • opensuse•leap

    42.3

  • oracle•peoplesoft_enterprise_peopletools

    8.56 | 8.57

  • redhat•enterprise_linux

    8.0

  • redhat•enterprise_linux_desktop

    7.0

  • redhat•enterprise_linux_server

    7.0

  • redhat•enterprise_linux_server_aus

    7.6

  • redhat•enterprise_linux_server_eus

    7.6

  • redhat•enterprise_linux_server_tus

    7.6

  • redhat•enterprise_linux_workstation

    7.0

  • the libssh2 project•libssh2

    1.8.1

References (27)