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Known exploited vulnerability · CISA KEV

CVE-2021-40655: D-Link DIR-605 Router Information Disclosure Vulnerability

D-Link DIR-605 routers contain an information disclosure vulnerability that allows attackers to obtain a username and password by forging a post request to the /getcfg.php page.

CVE-2021-40655

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2024-05-16: attackers are using it right now.

CISA KEV
Listed
Added 2024-05-16 · federal fix-by 2024-06-06
EPSS (30 days)
87%
Higher than 99.7% of CVEs · 2026-11-01
CVSS v3.1
7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

What CISA says

D-Link DIR-605 Router Information Disclosure Vulnerability

This vulnerability affects legacy D-Link products. All associated hardware revisions have reached their end-of-life (EOL) or end-of-service (EOS) life cycle and should be retired and replaced per vendor instructions.

NVD description · published 2021-09-24

An informtion disclosure issue exists in D-LINK-DIR-605 B2 Firmware Version : 2.01MT. An attacker can obtain a user name and password by forging a post request to the / getcfg.php page

Full record on NVD

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How to check if you are exposed to CVE-2021-40655

  1. Find every D-Link DIR-605 Router system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2021-40655.

US federal agencies had to fix this by 2024-06-06. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Affected versions

Versions the National Vulnerability Database lists as vulnerable to CVE-2021-40655. Check the vendor advisory for the exact fixed builds before you sign anything off.

ProductVulnerable versions
D-Link Dir-605l Firmware2.01mt

Timeline

  1. · Published in the National Vulnerability Database
  2. · Added to CISA's Known Exploited Vulnerabilities catalog, 965 days after it was published
  3. · Fix-by date for US federal agencies, passed 878 days ago

Vendor advisories and fixes

Weakness type

More exploited D-Link vulnerabilities

CISA lists 26 exploited D-Link vulnerabilities. The closest matches:

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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