CVE-2018-6210: D-Link DIR-620 devices, with a certain Rostelekom variant of firmware 1.0.37, have a hardcoded rostel account,

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CRITICAL 9.8REMOTEMITIGATE

CVE-2018-6210 is a critical-severity flaw (CVSS 9.8) affecting dir-620 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

D-Link DIR-620 devices, with a certain Rostelekom variant of firmware 1.0.37, have a hardcoded rostel account, which makes it easier for remote attackers to obtain access via a TELNET session.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.0% (top 13%)
CISA exploited list	No
Weakness	CWE-798
Published	2018-06-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dlink

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

Am I affected?

Timeline

2018-06-19 19:29 UTCPublished CVE record published
2026-06-17 02:01 UTCUpdated Record last modified

dlink dir-620 firmware MITIGATE

Affected: 1.0.37

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.37

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-2018-6210?

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

Is CVE-2018-6210 being exploited?

CVE-2018-6210 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-2018-6210 affect?

CVE-2018-6210 affects dir-620 firmware. Severity is critical (CVSS 9.8). D-Link DIR-620 devices, with a certain Rostelekom variant of firmware 1.0.37, have a hardcoded rostel account, which makes it easier for remote attackers to obtain access via a TELNET session.

How urgent is CVE-2018-6210?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

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-2018-6211 HIGH 7.2 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,

References

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