CVE-2018-18439

CRITICAL

DENX U-Boot through 2018.09-rc1 has a remotely exploitable buffer overflow via a malicious TFTP server because TFTP traffic is mishandled. Also, local exploitation can occur via a crafted kernel image.

Affects 1 product across 1 vendor.

BCS7.07
CVSS 3.19.8
EPSS2.0%
Percentile79th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-119: Improper Restriction of Operations within Memory Buffer

Parent class for buffer-related vulnerabilities where operations exceed buffer boundaries.

Related Attack Patterns (CAPEC)
CAPEC-8 Buffer Overflow in an API Call
via CWE-119
CAPEC-9 Buffer Overflow in Local Command-Line Utilities
via CWE-119
CAPEC-10 Buffer Overflow via Environment Variables
via CWE-119
CAPEC-14 Client-side Injection-induced Buffer Overflow
via CWE-119
CAPEC-24 Filter Failure through Buffer Overflow
via CWE-119
Show all 12

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ SAGE Intelligence — CITED Relevance Research Team

This vulnerability was disclosed in 2018. A critical vulnerability affects Denx systems (CVE-2018-18439). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-2018-GLOBAL-328324-C • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2018-18439?
This vulnerability was disclosed in 2018. A critical vulnerability affects Denx systems (CVE-2018-18439). No public exploit code is currently available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-2018-18439?
CVE-2018-18439 has CVSS 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 2.0%.
Is CVE-2018-18439 actively exploited?
No confirmed active exploitation of CVE-2018-18439 as of 2026-05-30.
How do I remediate CVE-2018-18439?
Priority: MEDIUM.
What systems are affected by CVE-2018-18439?
CVE-2018-18439 affects: Denx.
Vulnerability Details
CVE IDCVE-2018-18439
BSIDBS-2018-GLOBAL-328324-C BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2018-11-20
Last Modified2024-11-21
ICS Relevance15%
Weakness (CWE)
Improper Restriction of Operations within Memory Buffer
SourceNVD
Official Description

DENX U-Boot through 2018.09-rc1 has a remotely exploitable buffer overflow via a malicious TFTP server because TFTP traffic is mishandled. Also, local exploitation can occur via a crafted kernel image.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: DENX U-Boot through 2018.09-rc1 has a remotely exploitable buffer overflow via a malicious TFTP server because TFTP traffic is mishandled. Also, local exploitation can occur via a crafted kernel image. CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Exploitation Likelihood: LOW

Affected Products
VendorProductFixed Version
Denx U-Boot —
Remediation

No patch URL on record. Monitor vendor security advisories directly.

Threat Intelligence
● Threat Intelligence Validated: July 2026 | Threat Age: 2804 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
SAGE Enrichment Record — provenance & audit hash
Modelrule-based-v1
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hash89e885765ccb0ce29637ea2db76dcd13cc6dd0335c23e16b1a86b850507d68e84ed9016d4a94d3676bda9a5369d3271bb5b31675990b58bddbdeb84b0adda713
Related CVEs affecting Denx
CVE-2019-14194 9.8 Siemens Ruggedcom Rox CVE-2019-14193 9.8 Siemens Ruggedcom Rox CVE-2019-14192 9.8 Siemens Ruggedcom Rox CVE-2019-11059 9.8 Das U-Boot 2016.11-rc1 through 2019.04 mishandles the ext4 64-bit extension, ... CVE-2019-14195 9.8 Siemens Ruggedcom Rox
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