CVE-2021-20237 is an uncontrolled resource consumption (memory leak) flaw in ZeroMQ's libzmq library, affecting versions prior to 4.3.3. A remote, unauthenticated attacker can exploit this vulnerability by sending crafted PUB messages, leading to excessive memory consumption and a denial of service if CURVE/ZAP authentication is disabled. Rated 7.5 HIGH on the CVSS scale, this vulnerability has a low attack complexity and directly impacts system availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 4.2.0, < 4.3.3CPE matchmatch criteria | cpe:2.3:a:zeromq:libzmq:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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