What is CVE-2026-3978?

CVE-2026-3978 is a high-severity vulnerability in D-link Dir-513, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-03-12.

How severe is CVE-2026-3978?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in D-link Dir-513

CVE-2026-3978

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 ca…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (14.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R.

Affected products

D-link Dir-513 — versions 1.10

Weakness classification (CWE)

References

VDB-350413 | D-Link DIR-513 formEasySetupWizard3 stack-based overflow (vdb-entry, technical-description)
VDB-350413 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #769586 | D-Link DIR-513 1.10 Stack-based Buffer Overflow (third-party-advisory)
github.com/Litengzheng/vul_db/blob/main/Dir513/vul_21/README.md (exploit)
www.dlink.com/ (product)

Frequently asked questions

What is CVE-2026-3978?: CVE-2026-3978 is a high-severity vulnerability in D-link Dir-513, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-03-12.
How severe is CVE-2026-3978?: High severity. CVSS v3 base score is 8.8 out of 10.