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PatchSiren cyber security CVE debrief

CVE-2021-30116 Kaseya CVE debrief

CVE-2021-30116 is a Kaseya Virtual System/Server Administrator (VSA) information disclosure vulnerability that CISA added to the Known Exploited Vulnerabilities catalog on 2021-11-03. CISA marked the issue as known to be used in ransomware campaigns and set a remediation due date of 2021-11-17, making this a high-priority item for VSA operators.

Vendor
Kaseya
Product
Virtual System/Server Administrator (VSA)
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Organizations that run Kaseya Virtual System/Server Administrator (VSA), especially IT teams, managed service providers, vulnerability management teams, and incident response teams responsible for internet-facing or production VSA deployments.

Technical summary

The supplied official records identify CVE-2021-30116 as an information disclosure vulnerability in Kaseya Virtual System/Server Administrator (VSA). The CISA KEV entry records it as actively exploited, with known ransomware campaign use, and directs organizations to apply updates per vendor instructions. The source corpus does not provide a CVSS score or deeper technical exploitation details.

Defensive priority

Urgent. The CVE is listed in CISA KEV, has a remediation due date of 2021-11-17, and is associated with known ransomware campaign use in the official catalog.

Recommended defensive actions

  • Identify all Kaseya Virtual System/Server Administrator (VSA) deployments and confirm whether they are affected.
  • Apply vendor updates and follow the vendor instructions referenced by CISA as soon as possible.
  • Prioritize remediation using the CISA KEV due date as the deadline for action.
  • Review access and authentication controls around VSA deployment and limit exposure where possible.
  • Monitor VSA environments for unusual access or other signs of compromise while remediation is underway.

Evidence notes

This debrief is based only on the supplied CISA KEV source item metadata and the official resource links provided. The source metadata states: vendorProject Kaseya, product Virtual System/Server Administrator (VSA), vulnerabilityName Kaseya Virtual System/Server Administrator (VSA) Information Disclosure Vulnerability, dateAdded 2021-11-03, dueDate 2021-11-17, and knownRansomwareCampaignUse Known. The official CISA KEV catalog entry and CVE/NVD records are the supported public references.

Official resources

Publicly listed in CISA’s Known Exploited Vulnerabilities catalog on 2021-11-03; the supplied KEV metadata marks known ransomware campaign use as Known and sets a remediation due date of 2021-11-17.