CVE-2021-40539Vulnerability
Zoho ManageEngine ADSelfService Plus Authentication Bypass Vulnerability
Exploited in the wildCISA added it to its Known Exploited Vulnerabilities list on .
Reported by 1 independent source · first reported by Huntress · last reported
Last reported 3 years ago
CISA KEVAdded 3 Nov 2021
Fix due 17 Nov 2021
Used by ransomware: knownCISA KEV catalogue
Fix due 17 Nov 2021
Used by ransomware: knownCISA KEV catalogue
EPSS99.0%
higher than 99% of CVEsFIRST EPSS, as of 16 Oct 2026
higher than 99% of CVEsFIRST EPSS, as of 16 Oct 2026
What the reports say
1 report, newest first · the exact sentence from each-
Calm In The Storm: Reviewing Volt Typhoon“Zoho ManageEngine ADSelfService Plus (CVE-2021-40539)”
Thanks — we review every report.