CVE-2021-30121

Name: CVE-2021-30121
Creator: NVD / NIST
Published: 2021-07-09T14:15:07.93+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 4.83%

Last modified Jun 17, 2026

CVE-2021-30121 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 4.83% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

4.83%

90.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-829

Affected Software

Vendor	Product	Versions
Kaseya	Vsa	< 9.5.6

References

https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/Patch, Third Party Advisory
https://csirt.divd.nl/CVE-2021-30121Exploit, Third Party Advisory
https://csirt.divd.nl/DIVD-2021-00011Patch, Third Party Advisory
https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/Patch, Third Party Advisory
https://csirt.divd.nl/CVE-2021-30121Exploit, Third Party Advisory
https://csirt.divd.nl/DIVD-2021-00011Patch, Third Party Advisory

Timeline

Published: Jul 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30121?

How severe is CVE-2021-30121?

CVE-2021-30121 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 4.83% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30121?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-30121?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST