Kaseya Virtual System/Server Administrator (VSA) Information Disclosure Vulnerability
Kaseya Virtual System/Server Administrator (VSA) contains an information disclosure vulnerability allowing an attacker to obtain the sessionId that can be used to execute further attacks against the system.
- Vendor
- Kaseya
- Product
- Virtual System/Server Administrator (VSA)
- CVSS
- 10.0
- EPSS (exploit probability)
- 85.7%
- Status
- kevransomware use
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2021-30116 being exploited?
Yes. CISA added CVE-2021-30116 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild. CISA marks it as known to be used in ransomware campaigns.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 85.7% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (14 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Kaseya Virtual System/Server Administrator (VSA) CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2017-18362 Kaseya VSA SQL Injection Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 86.8% | |
| CVE-2018-20753 Kaseya VSA Remote Code Execution Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 29.6% |