Denial of Service in ZeroMQ
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 3.4%
exploitation probability
3.4%top 12% of all CVEs
observed exploitation
nono source reports it
In ZeroMQ before version 4.3.3, there is a denial-of-service vulnerability. Users with TCP transport public endpoints, even with CURVE/ZAP enabled, are impacted. If a raw TCP socket is opened and connected to an endpoint that is fully configured with CURVE/ZAP, legitimate clients will not be able to exchange any message. Handshakes complete successfully, and messages are delivered to the library, but the server application never receives them. This is patched in version 4.3.3.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
zeromq · libzmqReferences
https://github.com/zeromq/libzmq/pull/3913https://github.com/zeromq/libzmq/pull/3973https://github.com/zeromq/libzmq/security/advisories/GHSA-25wp-cf8g-938mhttps://lists.debian.org/debian-lts-announce/2020/11/msg00017.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZ5IMNQXDB52JFBXHFLK4AHVORFELNNG/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YFW2ZELCCPS4VLU4OSJOH5YL6KFKTFYW/https://security.gentoo.org/glsa/202009-12