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Vulnerabilities

Vulnerability · CVE-2019-3859

An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions.

Published Mar 21, 2019 · catalog updated Oct 14, 2026 · An out of bounds

Check if you run it

No confirmed exploitation is on record for CVE-2019-3859. EPSS is 6.28%. Act only if a listed version of An out of bounds 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 out of bounds).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
6.28%
Remediation
Advisory link
Affected products
cpe debian/debian linux · cpe fedoraproject/fedora · cpe libssh2/libssh2 · cpe netapp/ontap select deploy administration utility · cpe opensuse/leap

An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.

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 debian/debian linux8.0
  • cpe debian/debian linux9.0
  • cpe fedoraproject/fedora28
  • cpe fedoraproject/fedora29
  • cpe libssh2/libssh2version unspecified
  • cpe netapp/ontap select deploy administration utilityversion unspecified
  • cpe opensuse/leap15.0
  • cpe opensuse/leap42.3

How to fix CVE-2019-3859

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-2019-3859. EPSS is 6.28%. Act only if a listed version of An out of bounds is installed.

Which versions are affected?

Compare what you have installed with debian/debian linux 8.0; debian/debian linux 9.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read. EPSS 6.28%. 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 out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.

  2. Oct 14, 2026 · NIST NVD

    Updated

    An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.

Sources

  • CVE.orgVulnerability recordCVE-2019-3859

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2019-3859

    30-day exploitation probability 6.3%

    first.org
  • NIST NVDVulnerability recordCVE-2019-3859

    An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.

    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.