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Vulnerability record · CVE-2018-20305 · published 20 December 2018

CVE-2018-20305: D-link dir-816 a2 firmware out-of-bounds write vulnerability

D Link · Dir 816 A2 Firmware

D-Link DIR-816 A2 1.10 B05 devices allow arbitrary remote code execution without authentication via the newpass parameter. In the /goform/form2userconfig.cgi handler function, a long password may lead to a stack-based buffer overflow and overwrite a return address.

9.8 CVSS 3.0 Critical EPSS 4.1% · top 9.7% CWE-787 · Out-of-bounds write
9.8CVSS 3.0 base score, v2 7.5
4.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

D-Link DIR-816 A2 1.10 B05 devices allow arbitrary remote code execution without authentication via the newpass parameter. In the /goform/form2userconfig.cgi handler function, a long password may lead to a stack-based buffer overflow and overwrite a return address.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/RootSoull/Vuln-Poc/tree/master/D-Link/DIR-816 ExploitThird Party Advisory
https://github.com/RootSoull/Vuln-Poc/tree/master/D-Link/DIR-816 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-20305), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.