PatchTheCVECVE-2021-30121: Semi-authenticated local file inclusion The contents of arbitrary files can be returned by the webserver Examp
CVE-2021-30121 is a medium-severity flaw (CVSS 6.5) affecting vsa. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- EPSS top 8%: very likely to be exploited
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 5.0% (top 8%) |
| CISA exploited list | No |
| Weakness | CWE-829 |
| Published | 2021-07-09 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-30121?
vsa: upgrade to 9.5.6. Exact commands for each OS are on this page.
Is CVE-2021-30121 being exploited?
CVE-2021-30121 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-30121 affect?
CVE-2021-30121 affects vsa. Severity is medium (CVSS 6.5). 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
How urgent is CVE-2021-30121?
Priority 51/100. EPSS top 8%: very likely to be exploited; Public exploit reference
Related CVEs
- CVE-2021-30120 CRITICAL 9.9 UPGRADE Kaseya VSA before 9.5.7 allows attackers to bypass the 2FA requirement
- CVE-2021-30119 MEDIUM 5.4 UPGRADE Authenticated reflective XSS in HelpDeskTab/rcResults.asp The parameter result of /HelpDeskTab/rcResults.asp i
- CVE-2021-30201 HIGH 7.5 UPGRADE The API /vsaWS/KaseyaWS.asmx can be used to submit XML to the system
- CVE-2021-30118 CRITICAL 9.8 UPGRADE An attacker can upload files with the privilege of the Web Server process for Kaseya VSA Unified Remote Monito
- CVE-2021-30117 CRITICAL 9.8 UPGRADE The API call /InstallTab/exportFldr.asp is vulnerable to a semi-authenticated boolean-based blind SQL injectio