CVE-2021-30121

Vsa vulnerability

CVSS

6.5

EPSS

4.8%

EPSS pct

91th

Exploited

No known

Semi-authenticated local file inclusion The contents of arbitrary files can be returned by the webserver Example request: `https://x.x.x.x/KLC/js/Kaseya.SB.JS/js.aspx?path=C:\Kaseya\WebPages\dl.asp` A valid sessionId is required but can be easily obtained via CVE-2021-30118

Affected vendor

Kaseya

Affected product

Vsa

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Weakness type (CWE)

CWE-829 — Inclusion of Functionality from Untrusted Control Sphere

Published

2021-07-09

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality.

Its EPSS score of 4.8% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 91% of all scored CVEs.

Check your external exposure to CVE-2021-30121

Confirm whether Kaseya Vsa is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-30121.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-30121

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-30121 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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Are you exposed to CVE-2021-30121?

Run an instant, non-intrusive external scan to check your attack surface for CVE-2021-30121.

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