Is CVE-2021-30120 in the CISA KEV catalog?

No. CVE-2021-30120 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-30120?

CVE-2021-30120 has a CVSS v3 base score of 9.9 (CRITICAL).

What is the EPSS score for CVE-2021-30120?

CVE-2021-30120 has an EPSS score of 5.70% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2021-30120?

No published fix for CVE-2021-30120 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2021-30120

CRITICALEPSS 92th pctl

9.9

CVSS v3

NVD

Description

Kaseya VSA before 9.5.7 allows attackers to bypass the 2FA requirement. The need to use 2FA for authentication in enforce client-side instead of server-side and can be bypassed using a local proxy. Thus rendering 2FA useless. Detailed description --- During the login process, after the user authenticates with username and password, the server sends a response to the client with the booleans MFARequired and MFAEnroled. If the attacker has obtained a password of a user and used an intercepting proxy (e.g. Burp Suite) to change the value of MFARequered from True to False, there is no prompt for the second factor, but the user is still logged in.

CWE-669

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

5.70%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Patch1

csirt.divd.nl

Third-Party Advisory2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.