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CVE-2021-40655

95
FAUCET Score

CVE-2021-40655 is an information disclosure vulnerability affecting D-Link DIR-605 B2 Firmware Version 2.01MT, allowing an unauthenticated attacker to obtain usernames and passwords by forging a POST request to the /getcfg.php page. This vulnerability has a CVSS score of 7.5 (High) due to its network attack vector and low attack complexity, leading to a high confidentiality impact. It is actively exploited in the wild, as confirmed by its presence in CISA's KEV catalog, and has garnered significant community discussion and media coverage, despite a lack of public Metasploit or ExploitDB modules.

Impacted Technologies

VendorProductVersion(s)CPE
2.01mtCPE matchmatch criteria
cpe:2.3:o:dlink:dir-605l_firmware:2.01mt:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
86.66%
Probability of exploitation in next 30 days
EPSS Percentile
99.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
Added to KEV · May 16, 2024
Nuclei: CVE-2021-40655 · Jun 4, 2025
This CVE's current EPSS score of 0.8666 is in the 100th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
github.com / Ilovewomen/D-LINK-DIR-605
ExploitThird Party Advisory
dlink.com / en/security-bulletin
Vendor Advisory