CVE-2017-9100: login.cgi on D-Link DIR-600M devices with firmware 3.04 allows remote attackers to bypass authentication by en

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HIGH 8.8MITIGATE

CVE-2017-9100 is a high-severity flaw (CVSS 8.8) affecting dir-600m firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

login.cgi on D-Link DIR-600M devices with firmware 3.04 allows remote attackers to bypass authentication by entering more than 20 blank spaces in the password field during an admin login attempt.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	85.5% (top 1%)
CISA exploited list	No
Weakness	CWE-287
Published	2017-05-21
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

2017-05-21 04:29 UTCPublished CVE record published
2026-06-17 01:27 UTCUpdated Record last modified

dlink dir-600m firmware MITIGATE

Affected: 3.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.04

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-2017-9100?

dir-600m firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-9100 being exploited?

CVE-2017-9100 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-2017-9100 affect?

CVE-2017-9100 affects dir-600m firmware. Severity is high (CVSS 8.8). login.cgi on D-Link DIR-600M devices with firmware 3.04 allows remote attackers to bypass authentication by entering more than 20 blank spaces in the password field during an admin login attempt.

How urgent is CVE-2017-9100?

Priority 61/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2024-1786 HIGH 7.5 MITIGATE ** UNSUPPORTED WHEN ASSIGNED ** A vulnerability, which was classified as critical, has been found in D-Link DI
CVE-2020-13960 HIGH 7.5 MITIGATE MITIGATE D-Link DSL 2730-U IN_1.10 and IN_1.11 and DIR-600M 3.04 devices have the domain.name string in the DNS resolve
CVE-2019-7736 CRITICAL 9.8 MITIGATE D-Link DIR-600M C1 3.04 devices allow authentication bypass via a direct request to the wan.htm page
CVE-2019-13101 CRITICAL 9.8 MITIGATE An issue was discovered on D-Link DIR-600M 3.02, 3.03, 3.04, and 3.06 devices
CVE-2018-16605 MEDIUM 5.4 MITIGATE D-Link DIR-600M devices allow XSS via the Hostname and Username fields in the Dynamic DNS Configuration page.

References

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