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Vulnerabilities

Vulnerability · CVE-2019-3855

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.

Published Mar 21, 2019 · catalog updated Oct 14, 2026 · An integer overflow flaw

Check if you run it

No confirmed exploitation is on record for CVE-2019-3855. EPSS is 9.29%. Act only if a listed version of An integer overflow flaw is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (An integer overflow flaw).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
9.29%
Remediation
Advisory link
Affected products
cpe apple/xcode · cpe debian/debian linux · cpe fedoraproject/fedora · cpe libssh2/libssh2 · cpe netapp/ontap select deploy administration utility · cpe opensuse/leap

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe apple/xcodeversion unspecified
  • cpe debian/debian linux8.0
  • cpe debian/debian linux9.0
  • cpe fedoraproject/fedora28
  • cpe fedoraproject/fedora29
  • cpe fedoraproject/fedora30
  • cpe libssh2/libssh2version unspecified
  • cpe netapp/ontap select deploy administration utilityversion unspecified
  • cpe opensuse/leap42.3
  • cpe oracle/peoplesoft enterprise peopletools8.56
  • cpe redhat/enterprise linux8.0

How to fix CVE-2019-3855

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2019-3855. EPSS is 9.29%. Act only if a listed version of An integer overflow flaw is installed.

Which versions are affected?

Compare what you have installed with debian/debian linux 8.0; debian/debian linux 9.0; oracle/peoplesoft enterprise peopletools 8.56; redhat/enterprise linux 8.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-190: Integer Overflow; CWE-787: Out-of-bounds Write. EPSS 9.29%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 21, 2019 · NIST NVD

    Detected

    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.

  2. Oct 14, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2019-3855

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2019-3855

    30-day exploitation probability 9.3%

    first.org
  • NIST NVDVulnerability recordCVE-2019-3855

    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 serv

    nvd.nist.gov
  • Packet Storm SecurityCited referencehttp://packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.