CVE-2026-3978: d-link dir-513
CVSS: 9.0v2.0HighAnalyzed
Published 12-03-2026Last modified 12-03-2026
Vulnerability summary
CVE-2026-3978 is a high (CVSS 9.0) vulnerability in d-link dir-513. EPSS estimates a 1.22% chance of exploitation in the next 30 days, higher than 68.1% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.0/10
010
High · v2.0 (CVE.org)EPSS score
1.22%
0%100%
Low · +0.50 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 12-03-2026PublishedVulnerability first disclosed.
- 12-03-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
7 scores · 2 sources · 4 versionsHigh 8.7Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:PSources2 sources · 7.4–8.7
- NVDNIST7.4HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XDiffers
High 8.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:RSourcesAll 2 agree
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
High 8.8Preferred score · CVE.org (CNA)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:RSourcesSingle source
High 9.0Preferred score · CVE.org (CNA)
AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:URSourcesAll 2 agree
- NVDNIST9.0HighAV:N/AC:L/Au:S/C:C/I:C/A:C
EPSS trend
Probability
1.22%
Chance of exploitation in the next 30 days
Percentile
68%
Versus all other CVEs
30-day change
+0.50 pp
From 0.71% on 19-09-2026
19-09-202619-10-2026
EPSS score1.22%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundVul Db
Maturity: poc
Weaknesses
CWE · root cause- CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
- CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
Affected systems
D-link1 product
- dir-5131.10
Dlink1 product
- dir-513_firmware1.10
2 vendors · 2 products
References
5 links- www.dlink.comProduct