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Vulnerability record · CVE-2018-6211 · published 20 June 2018

CVE-2018-6211: D-link dir-620 firmware os command injection vulnerability

D Link · Dir 620 Firmware

On D-Link DIR-620 devices with a certain customized (by ISP) variant of firmware 1.0.3, 1.0.37, 1.3.1, 1.3.3, 1.3.7, 1.4.0, and 2.0.22, OS command injection is possible as a result of incorrect processing of the res_buf parameter to index.cgi.

7.2 CVSS 3.0 High EPSS 5.8% · top 7.2% CWE-78 · OS command injection
7.2CVSS 3.0 base score, v2 9.0
5.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

On D-Link DIR-620 devices with a certain customized (by ISP) variant of firmware 1.0.3, 1.0.37, 1.3.1, 1.3.3, 1.3.7, 1.4.0, and 2.0.22, OS command injection is possible as a result of incorrect processing of the res_buf parameter to index.cgi.

CVSS:3.0/AV:N/AC:L/PR:H/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
http://www.securitynewspaper.com/2018/05/25/d-link-dir-620-routers-critical-vulnerabilities/ Third Party Advisory
https://securelist.com/backdoors-in-d-links-backyard/85530/ ExploitThird Party Advisory
https://securityaffairs.co/wordpress/72839/hacking/d-link-dir-620-flaws.html Third Party Advisory
https://www.bleepingcomputer.com/news/security/backdoor-account-found-in-d-link-dir-620-routers/ Third Party Advisory
http://www.securitynewspaper.com/2018/05/25/d-link-dir-620-routers-critical-vulnerabilities/ Third Party Advisory
https://securelist.com/backdoors-in-d-links-backyard/85530/ ExploitThird Party Advisory
https://securityaffairs.co/wordpress/72839/hacking/d-link-dir-620-flaws.html Third Party Advisory
https://www.bleepingcomputer.com/news/security/backdoor-account-found-in-d-link-dir-620-routers/ Third 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-2018-6211), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.