CVE-2021-20236
moderate-risk
Published 2021-05-28
A flaw was found in the ZeroMQ server in versions before 4.3.3. This flaw allows a malicious client to cause a stack buffer overflow on the server by sending crafted topic subscription requests and then unsubscribing. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
Do I need to act?
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0.32% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10
Critical
NETWORK
/ LOW complexity
Affected Products (4)
Affected Vendors
References (4)
43
/ 100
moderate-risk
Severity
32/34 · Critical
Exploitability
1/34 · Minimal
Exposure
10/34 · Low