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Exploited vulnerability · CISA KEV

Is CVE-2021-40655 exploited? Yes: in CISA KEV since 16 May 2024

Gociux · D-Link DIR-605 Router · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-40655, D-Link DIR-605 Router Information Disclosure Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 16 May 2024, 965 days after it was published. It affects D-Link DIR-605 Router. If you run it, CISA's required action is: 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.

exploitedYesCISA KEV · 16 May 2024
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity7.5CVSS 3.1 · high
US federal due6 Jun 2024BOD 22-01 deadline

What it is

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.

VendorD-Link (26 exploited CVEs in KEV)
ProductDIR-605 Router
VulnerabilityD-Link DIR-605 Router Information Disclosure Vulnerability
WeaknessCWE-863
Published24 Sep 2021
Added to KEV16 May 2024
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for DIR-605 Router in your asset inventory, including appliances and cloud images. Stack check lists every exploited D-Link CVE at once.
  2. Apply the fix. 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.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 24 Sep 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for D-Link.

References

Questions

Is CVE-2021-40655 being exploited?

Yes. CISA added CVE-2021-40655 to the Known Exploited Vulnerabilities catalog on 16 May 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-40655 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2021-40655?

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. Check D-Link's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected DIR-605 Router and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in May 2024 · D-Link scorecard · act-now radar.

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