CVE-2021-40655

HIGHNVD 7.59.0▲Trending — 4 sources updated this weekExploited in the wild

7.5

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

CVSS v3: 7.5
EG Score: 9.0(high)
EPSS: 99.8%
KEV: ⚠ Exploited

Published

September 24, 2021

Last Modified

November 10, 2025

References (5)

cve@mitrehttps://github.com/Ilovewomen/D-LINK-DIR-605/
cve@mitrehttps://www.dlink.com/en/security-bulletin/
af854a3a-2127-422b-91ae-364da2661108https://github.com/Ilovewomen/D-LINK-DIR-605/
af854a3a-2127-422b-91ae-364da2661108https://www.dlink.com/en/security-bulletin/
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40655

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 18:07 UTCEG score recompute
2026-06-04 18:07 UTCGHSA enrichment
2026-06-04 14:22 UTCEG score recompute
2026-06-04 14:22 UTCGHSA enrichment
2026-06-04 10:37 UTCEG score recompute
2026-06-04 10:37 UTCGHSA enrichment
2026-06-04 06:52 UTCEG score recompute
2026-06-04 06:52 UTCGHSA enrichment
2026-06-04 03:07 UTCEG score recompute
2026-06-04 03:07 UTCGHSA enrichment
2026-06-03 23:22 UTCEG score recompute
2026-06-03 23:22 UTCGHSA enrichment
2026-06-03 19:37 UTCEG score recompute
2026-06-03 19:37 UTCGHSA enrichment
2026-06-03 19:09 UTCkev_newly_listed
2026-06-03 15:52 UTCEG score recompute
2026-06-03 15:52 UTCGHSA enrichment
2026-06-03 12:07 UTCEG score recompute
2026-06-03 12:07 UTCGHSA enrichment
2026-06-03 08:22 UTCEG score recompute

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Nucleihttp/cves/2021/CVE-2021-40655.yaml
First seen Jan 1, 2021
D-Link DIR-605 - Information Disclosure
Open source ↗

Frequently asked(6)

What is CVE-2021-40655?

CVE-2021-40655 is a high vulnerability published on September 24, 2021. 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

When was CVE-2021-40655 disclosed?

CVE-2021-40655 was first published in the National Vulnerability Database on September 24, 2021, with the most recent update on November 10, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-40655 actively exploited?

Yes. CISA added CVE-2021-40655 to the Known Exploited Vulnerabilities catalog on May 16, 2024, affecting D-Link DIR-605 Router. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.

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

CVE-2021-40655 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.

Which products are affected by CVE-2021-40655?

CVE-2021-40655 affects D-Link DIR-605 Router. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.

How do I remediate CVE-2021-40655?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-40655, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-40655

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CVE-2021-40655

📅 Published

🔄 Last Modified

🔗 References (5)

Weakness Classification(2)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(6)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-40655?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (5)

Frequently asked(6)

Related CVEs(same CWE)