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 can be launched remotely. The exploit is now public and may be used.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.012 (66.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.012 · change: +0.005
Affected products
- D-Link Dir-513 — versions 1.10
- Dlink Dir-513
- Dlink Dir-513 Firmware — versions 1.10
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/Litengzheng/vul_db/blob/main/Dir513/vul_21/README.md (Exploit, Third Party Advisory, exploit)
- www.dlink.com/ (Product, product)
Frequently asked questions
- What is CVE-2026-3978?
- CVE-2026-3978 is a high-severity vulnerability in D-Link Dir-513, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. 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.