What’s Vulnerable › Vulnerabilities

CVE-2018-6211

• Severity: high (CVSS 7.2 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-06-20 · updated 2026-06-17
• Weakness: CWE-78

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.

Affected products

• D-Link Dir-620 Firmware: 1.0.3, 1.0.37, 1.3.1, 1.3.3, 1.3.7, 1.4.0 (+1)

References

• http://www.securitynewspaper.com/2018/05/25/d-link-dir-620-routers-critical-vulnerabilities/
• https://securelist.com/backdoors-in-d-links-backyard/85530/
• https://securityaffairs.co/wordpress/72839/hacking/d-link-dir-620-flaws.html
• https://www.bleepingcomputer.com/news/security/backdoor-account-found-in-d-link-dir-620-routers/
• http://www.securitynewspaper.com/2018/05/25/d-link-dir-620-routers-critical-vulnerabilities/
• https://securelist.com/backdoors-in-d-links-backyard/85530/
• https://securityaffairs.co/wordpress/72839/hacking/d-link-dir-620-flaws.html
• https://www.bleepingcomputer.com/news/security/backdoor-account-found-in-d-link-dir-620-routers/

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