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Vulnerabilities/CVE-2019-3855Public Intelligence Dossier
Source: libssh2 · Limited verification•Last verified: •Collection Degraded
CVE-2019-3855Unknown / EvaluatingHIGH (raw)CVSS 9.3CWE-190

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: 22 Mar 2019•Last updated: 14 Oct 2026, 12:46 PM IST•Source identifier: secalert@redhat.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance not available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
9.3HIGH (raw)
AV:N/AC:M/Au:N/C:C/I:C/A:C
Metric sourcenvd@nist.gov
EPSS probability
9.3%0.093
Percentile95th
Weakness type
CWE-190
CWE-787
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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.

SOC priority

High

Actively exploited

Unknown

Publicly disclosed

Unknown

Risk basis: SOC ecosystem technology relevance; HIGH severity; No confirmed exploitation signal in current enrichment

Affected Products & Remediation

14 source-backed products
Affected products and versions (source)
  • libssh2 libssh2 · < 1.8.1 · NVD CPE · Source
  • fedoraproject fedora · 28; 29; 30 · NVD CPE · Source
  • debian debian linux · 8.0; 9.0 · NVD CPE · Source
  • netapp ontap select deploy administration utility · version range not provided by source · NVD CPE · Source
  • redhat enterprise linux · 8.0; desktop 7.0; server 7.0; server aus 7.6; server eus 7.6; server tus 7.6; workstation 7.0 · NVD CPE · Source
  • redhat enterprise linux desktop · 7.0 · NVD CPE · Source
  • redhat enterprise linux server · 7.0; aus 7.6; eus 7.6; tus 7.6 · NVD CPE · Source
  • redhat enterprise linux server aus · 7.6 · NVD CPE · Source
  • redhat enterprise linux server eus · 7.6 · NVD CPE · Source
  • redhat enterprise linux server tus · 7.6 · NVD CPE · Source
  • redhat enterprise linux workstation · 7.0 · NVD CPE · Source
  • opensuse leap · 42.3 · NVD CPE · Source
  • apple xcode · < 11.0 · NVD CPE · Source
  • oracle peoplesoft enterprise peopletools · 8.56; 8.57 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

No rule-based guidance for this vulnerability class

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
secalert@redhat.com
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:libssh2:libssh2:*:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*, cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*, cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:*, cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*, cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*

Evidence & Provenance

3 public sources
nvd.nist.govSource recordaccess.redhat.comSource recordaccess.redhat.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2019-3855
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2019-3855
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2019-3855"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

Correlated briefings

— No published briefing references this CVE

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.