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Dir 513 Firmware CVE-2026-3978

HIGH
Buffer Overflow (CWE-119)
2026-03-12 cna@vuldb.com
Buffer Overflow D-Link Dir 513 Firmware
8.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.8 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 19:57 vuln.today
CVE Published
Mar 12, 2026 - 04:16 nvd
HIGH 8.8

DescriptionCVE.org

A vulnerability was detected in D-Link DIR-513 1.10. The impacted element is an unknown function of the file /goform/formEasySetupWizard3. The manipulation of the argument wan_connected results in stack-based buffer overflow. The attack can be launched remotely. The exploit is now public and may be used.

AnalysisAI

Remote code execution in D-Link DIR-513 firmware version 1.10 through a stack-based buffer overflow in the /goform/formEasySetupWizard3 endpoint allows unauthenticated attackers to achieve full system compromise over the network. The vulnerability can be exploited with minimal complexity using publicly available exploit code, and no patch is currently available to remediate the issue.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to D-Link DIR-513
Exploit
Send crafted request to /goform/formEasySetupWizard3
Execution
Overflow wan_connected parameter
Impact
Execute arbitrary code as device admin
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Vulnerability AssessmentAI

Exploitation D-Link DIR-513 firmware version 1.10 with /goform/formEasySetupWizard3 endpoint accessible. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 8.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote attacker could exploit this flaw, stack-based buffer overflow.
Remediation Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all D-Link DIR-513 1.10 devices in your environment and isolate affected units from critical network segments; document findings and notify relevant business stakeholders. …

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CVE-2026-3978 vulnerability details – vuln.today
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