MEDIUM
CVE-2021-30121
CWE-829Published: July 9, 2021· Updated: Jun 17, 2026
6.5
CVSS v3.1
Official 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
Technical Analysis
CVE-2021-30121 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected Vendors & Products
kaseya1 product(s)
vsa
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (6)
→
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
Quick Facts
CVE IDCVE-2021-30121
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-829
CISA KEVNo
Affected1 vendor(s)
PublishedJul 9, 2021
Related CVEs (CWE-829)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-30121 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.