How severe is CVE-2021-30121?

CVE-2021-30121 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-30121 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30121?

CVE-2021-30121 affects Kaseya Vsa. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-30121?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-30121 published?

CVE-2021-30121 was published on 2021-07-09 and last updated on 2026-06-17.

CVE-2021-30121

CVE-2021-30121 is a medium-severity vulnerability in Kaseya Vsa with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-829.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-829
Affected product: Kaseya Vsa
Published: 2021-07-09
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-30121?: 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
How severe is CVE-2021-30121?: CVE-2021-30121 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-30121 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30121?: CVE-2021-30121 affects Kaseya Vsa. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-30121?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-30121 published?: CVE-2021-30121 was published on 2021-07-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:kaseya:vsa:*:*:*:*:-:*:*:*

More vulnerabilities in Kaseya Vsa

CVE-2021-30120 — Critical (CVSS 9.9): Kaseya VSA before 9.5.7 allows attackers to bypass the 2FA requirement. The need to use 2FA for authentication in…
CVE-2021-30118 — Critical (CVSS 9.8): An attacker can upload files with the privilege of the Web Server process for Kaseya VSA Unified Remote Monitoring &…
CVE-2021-30117 — Critical (CVSS 9.8): The API call /InstallTab/exportFldr.asp is vulnerable to a semi-authenticated boolean-based blind SQL injection in the…
CVE-2021-30201 — High (CVSS 7.5): The API /vsaWS/KaseyaWS.asmx can be used to submit XML to the system. When this XML is processed (external) entities…
CVE-2019-14510 — Medium (CVSS 6.7): An issue was discovered in Kaseya VSA RMM through 9.5.0.22. When using the default configuration, the LAN Cache feature…
CVE-2021-30119 — Medium (CVSS 5.4): Authenticated reflective XSS in HelpDeskTab/rcResults.asp The parameter result of /HelpDeskTab/rcResults.asp is…

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