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Collection Degraded30 / 46 Sources HealthyPublic Intel Only
Vulnerabilities/CVE-2019-5436Public Intelligence Dossier
Source: haxx · Limited verification•Last verified: •Collection Degraded
CVE-2019-5436Unknown / EvaluatingHIGH (raw)CVSS 7.8CWE-122

A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl versions 7.19.4 through 7.64.1.

Published: 29 May 2019•Last updated: 14 Oct 2026, 12:46 PM IST•Source identifier: support@hackerone.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
7.8HIGH (raw)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Metric sourcenvd@nist.gov
EPSS probability
49.7%0.497
Percentile99th
Weakness type
CWE-122
CWE-787
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl versions 7.19.4 through 7.64.1.

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

11 source-backed products
Affected products and versions (source)
  • haxx libcurl · >= 7.19.4 <= 7.64.1 · NVD CPE · Source
  • opensuse leap · 15.0; 15.1; 42.3 · NVD CPE · Source
  • fedoraproject fedora · 29 · NVD CPE · Source
  • debian debian linux · 9.0; 10.0 · NVD CPE · Source
  • f5 traffix signaling delivery controller · >= 5.0.0 <= 5.1.0 · NVD CPE · Source
  • netapp hci management node · version range not provided by source · NVD CPE · Source
  • netapp solidfire · version range not provided by source · NVD CPE · Source
  • netapp steelstore cloud integrated storage · version range not provided by source · NVD CPE · Source
  • oracle enterprise manager ops center · 12.3.3; 12.4.0 · NVD CPE · Source
  • oracle mysql server · <= 5.7.27; >= 5.7.28 <= 8.0.17 · NVD CPE · Source
  • oracle oss support tools · 20.0 · 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.

Matched local-privilege-escalation (CVSS AV:L, CVSS PR:L)

Exposure

  1. Identify hosts reporting this CVE, prioritising shared or multi-user systems.Telemetry: DeviceTvmSoftwareVulnerabilities · A local, low-privilege vector matters most where untrusted users can run code. · Rule local-privilege-escalation

Exploitation evidence

  1. Look for low-privileged processes spawning SYSTEM or root-level child processes on affected hosts.Telemetry: DeviceProcessEvents · Hunting hypothesis from the CVSS vector; privilege transitions are a focused starting point, not evidence of attack. · Rule local-privilege-escalation

Response

  1. Confirm the source-stated update on affected hosts.Telemetry: DeviceTvmSoftwareVulnerabilities · Host inventory can verify remediation. · Rule local-privilege-escalation

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
support@hackerone.com
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:haxx:libcurl:*:*:*:*:*:*:*:*, cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*, cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*, cpe:2.3:o:opensuse:leap:42.3:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*, cpe:2.3:a:f5:traffix_signaling_delivery_controller:*:*:*:*:*:*:*:*, cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*, cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*

Evidence & Provenance

3 public sources
nvd.nist.govSource recordcurl.haxx.seSource recordlists.fedoraproject.orgSource 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-2019-5436
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2019-5436
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2019-5436"| 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.