CVEs / CVE-2021-40655

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

Known exploited in the CISA KEV catalog since 16 May 2024
high 7.5 CVSS 3.1 (NVD)
EPSS 87% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
Last changed at its sources 17 Jun 2026

Are you affected? Check your servers with Stackurity: it lists the software on each server and the vulnerabilities to fix first.

Check your servers with Stackurity Already using Stackurity? Search for CVE-2021-40655

Summary

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.
CISA, Known Exploited Vulnerabilities catalog

Description

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
The CVE record, via NVD · published 24 Sep 2021 · NVD status: Analyzed

Affected and fixed versions

As stated by the CVE record (from the CNA)
Product	Affected	Fixed in
n/a n/a	n/a	—
dlink dir-605l_firmware	2.01mt	—
dlink dir-605l	b2	—

Exploitation

In CISA KEV since	16 May 2024
Due date for US federal agencies	6 Jun 2024
Used in ransomware campaigns	Unknown
Required action	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.

Severity

CVSS 3.1	7.5 high `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N` Scored by NVD
Weakness	CWE-863

References

CVE-2021-40655 on NVD
CVE-2021-40655 in the CISA KEV catalog
https://legacy.us.dlink.com/pages/product.aspx?id=2b09e95d90ff4cb38830ecc04c89cee5 (cited by CISA)
https://github.com/Ilovewomen/D-LINK-DIR-605/ Exploit, Third Party Advisory
https://www.dlink.com/en/security-bulletin/ Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40655 US Government Resource

Sources

Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.

This product uses data from the NVD API but is not endorsed or certified by the NVD.