CVE-2018-6211: 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,

This month

HIGH 7.2MITIGATE

CVE-2018-6211 is a high-severity flaw (CVSS 7.2) affecting dir-620 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
EPSS top 7%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	5.7% (top 7%)
CISA exploited list	No
Weakness	CWE-78
Published	2018-06-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: d-link

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-06-20 16:29 UTCPublished CVE record published
2026-06-17 02:01 UTCUpdated Record last modified

d-link dir-620 firmware MITIGATE

Affected: 1.0.3 · 1.0.37 · 1.3.1 · 1.3.3 · 1.3.7 · 1.4.0 · 2.0.22

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.3

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-6211?

dir-620 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-6211 being exploited?

CVE-2018-6211 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-6211 affect?

CVE-2018-6211 affects dir-620 firmware. Severity is high (CVSS 7.2). 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.c

How urgent is CVE-2018-6211?

Priority 53/100. High severity; EPSS top 7%: very likely to be exploited; Public exploit reference

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2018-6213 CRITICAL 9.8 MITIGATE In the web server on D-Link DIR-620 devices with a certain customized (by ISP) variant of firmware 1.0.3, 1.0.
CVE-2018-6212 MEDIUM 6.1 MITIGATE 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,
CVE-2018-6210 CRITICAL 9.8 MITIGATE D-Link DIR-620 devices, with a certain Rostelekom variant of firmware 1.0.37, have a hardcoded rostel account,

References

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