Is CVE-2021-40655 in the CISA KEV catalog?

Yes. CVE-2021-40655 is on the CISA Known Exploited Vulnerabilities list, added 2024-05-16.

What is the CVSS severity of CVE-2021-40655?

CVE-2021-40655 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-40655?

CVE-2021-40655 has an EPSS score of 87.04% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2021-40655?

CVE-2021-40655 affects an end-of-life product with no vendor fix. CISA advises disconnecting affected systems.

CVE & CISA-KEV Catalog

CVE-2021-40655

HIGHCISA KEVEPSS 100th pctl

7.5

CVSS v3

NVD

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

CWE-863Incorrect Authorization

How to fix

No fix available - end of life

This product no longer receives security updates. CISA advises disconnecting affected systems if still in use.

CISA 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.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

87.04%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

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.

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.

Remediation due: 2024-06-06

References

Exploit1

github.com

Vendor Advisory1

dlink.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2025-29927	Critical	9.1	99%	-	Fix
CVE-2020-36289	Medium	5.3	99%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-10.