CVE-2021-30116 Kaseya Virtual System/Server Administrator (VSA): information leak
In plain words: The program reveals information it should keep private. Leaked secrets — tokens, passwords or memory contents — that help a bigger attack.
Confirmed exploited by CISA on · US federal patch deadline Nov 17, 2021
What to do
- Install Kaseya's security update for Virtual System/Server Administrator (VSA). If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Kaseya Virtual System/Server Administrator (VSA) Information Disclosure Vulnerability
- Product
- Kaseya Virtual System/Server Administrator (VSA)
- CISA description
- 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.
- Type of flaw
- Information leak (CWE-522)
- Confirmed exploited
- Nov 3, 2021 — known to be used in ransomware attacks
- US federal patch deadline
- Nov 17, 2021
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Answering about CVE-2021-30116 ·
Questions about CVE-2021-30116
Is CVE-2021-30116 being exploited?
Yes. CISA added CVE-2021-30116 to its Known Exploited Vulnerabilities catalog on Nov 3, 2021, which means there is reliable evidence of real-world attacks, including by ransomware groups.
How do I fix CVE-2021-30116?
Install Kaseya's security update for Virtual System/Server Administrator (VSA). If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2021-30116?
Only if you use Kaseya Virtual System/Server Administrator (VSA). Aimed mostly at company systems — you are affected through the companies you use, not your own phone.