CVE-2021-42627: The WAN configuration page "wan.htm" on D-Link DIR-615 devices with firmware 20.06 can be accessed directly wi

This week

CRITICAL 9.8REMOTEMITIGATEMITIGATEMITIGATE

CVE-2021-42627 is a critical-severity flaw (CVSS 9.8) affecting dir-615 firmware, dir-615 j1 firmware, dir-615 t1 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The WAN configuration page "wan.htm" on D-Link DIR-615 devices with firmware 20.06 can be accessed directly without authentication which can lead to disclose the information about WAN settings and also leverage attacker to modify the data fields of page.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
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	63.1% (top 1%)
CISA exploited list	No
Published	2022-08-23
Last modified	2026-07-09

Publisher (CNA): MITRE · Vendor: dlink

Last updated 2026-07-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-08-23 12:15 UTCPublished CVE record published
2026-07-09 01:17 UTCUpdated Record last modified

dlink dir-615 firmware MITIGATE

Affected: 20.06

Fixed in: no fixed release known

Safe to downgrade to: a release before 20.06

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.

dlink dir-615 j1 firmware MITIGATE

Affected: 20.06

Fixed in: no fixed release known

Safe to downgrade to: a release before 20.06

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.

dlink dir-615 t1 firmware MITIGATE

Affected: 20.06

Fixed in: no fixed release known

Safe to downgrade to: a release before 20.06

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.

dlink dir-615jx10 firmware MITIGATE

Affected: 20.06

Fixed in: no fixed release known

Safe to downgrade to: a release before 20.06

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: D-Link DIR-615 - Unauthorized Access

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-2021-42627?

dir-615 firmware: mitigate or apply the listed mitigation; dir-615 j1 firmware: mitigate or apply the listed mitigation; dir-615 t1 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-42627 being exploited?

CVE-2021-42627 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-2021-42627 affect?

CVE-2021-42627 affects dir-615 firmware, dir-615 j1 firmware, dir-615 t1 firmware. Severity is critical (CVSS 9.8). The WAN configuration page "wan.htm" on D-Link DIR-615 devices with firmware 20.06 can be accessed directly without authentication which can lead to disclose the information about WAN settings and also leverage attacker to modify the data f

How urgent is CVE-2021-42627?

Priority 64/100. Critical severity; EPSS top 1%: very likely to be exploited; Remotely exploitable, no login, no user action

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2026-2152 HIGH 7.2 MITIGATE A vulnerability was found in D-Link DIR-615 4.10
CVE-2026-2151 HIGH 7.2 MITIGATE A vulnerability has been found in D-Link DIR-615 4.10
CVE-2026-1506 HIGH 7.2 MITIGATE A vulnerability was determined in D-Link DIR-615 4.10
CVE-2026-1505 HIGH 7.2 MITIGATE A vulnerability was found in D-Link DIR-615 4.10
CVE-2026-1448 HIGH 7.2 UPGRADE A vulnerability was detected in D-Link DIR-615 up to 4.10

References

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