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ExploitedIn CISA KEV

CVE-2021-40655

Exploitation confirmed. First attested on 2024-05-16 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2021-09-24
  • WeaknessCWE-863

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

Timeline

dates in UTC
  1. 2021-09-2421:15CVE publishedNVD
  2. 2024-05-16Added to the CISA KEV catalogCISA KEV
  3. 2024-05-16Listed as exploited by GCVEGCVE
  4. 2024-05-16Exploitation first reportedCISA KEV
  5. 2025-02-0415:44SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-40655?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-40655?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

CISA-ADP · NVD
Dlink dir-605l
BranchAffectedFixed in
—= b2no fix published
Dlink dir-605l firmwareversion to verify
BranchAffectedFixed in
2.1= 2.01mtno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. CISA’s 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.due 2024-06-06

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2024-05-16
Patch Due Date
2024-06-06
Ransomware Use
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.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2021-09-24
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-95fh-63xw-wfh3

Frequently asked questions

What is CVE-2021-40655?

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

Is CVE-2021-40655 actively exploited?

Yes. CVE-2021-40655 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2024-06-06.

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

CVE-2021-40655 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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Sources for this record