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Exploited vulnerability · CISA KEV

Is CVE-2021-44515 exploited? Yes: in CISA KEV since 10 Dec 2021

Gociux · Zoho Desktop Central · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-44515, Zoho Desktop Central Authentication Bypass Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 10 Dec 2021. It affects Zoho Desktop Central. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 10 Dec 2021
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due24 Dec 2021BOD 22-01 deadline

What it is

Zoho Desktop Central contains an authentication bypass vulnerability that could allow an attacker to execute arbitrary code in the Desktop Central MSP server.

VendorZoho (9 exploited CVEs in KEV)
ProductDesktop Central
VulnerabilityZoho Desktop Central Authentication Bypass Vulnerability
Weaknessnot specified
Published12 Dec 2021
Added to KEV10 Dec 2021
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Desktop Central in your asset inventory, including appliances and cloud images. Stack check lists every exploited Zoho CVE at once.
  2. Apply the fix. Apply updates 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 12 Dec 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for Zoho.

References

Questions

Is CVE-2021-44515 being exploited?

Yes. CISA added CVE-2021-44515 to the Known Exploited Vulnerabilities catalog on 10 Dec 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-44515 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-2021-44515?

Apply updates per vendor instructions. Check Zoho's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Desktop Central 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 December 2021 · Zoho scorecard · act-now radar.

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