CVE-2018-6212 — On D-Link DIR-620 devices with a certain customized (by ISP) variant of 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, a reflected Cross-Site Scripting (XSS) attack is possible as a result of missed filtration for special characters in the "Search" fiel

01What is this vulnerability?

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, a reflected Cross-Site Scripting (XSS) attack is possible as a result of missed filtration for special characters in the "Search" field and incorrect processing of the XMLHttpRequest object.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2018-06-20T16:00:00.000Z
• Last modified: 2024-08-05T05:54:53.248Z

09References

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