| Name | CVE-2021-20237 |
| Description | An uncontrolled resource consumption (memory leak) flaw was found in ZeroMQ's src/xpub.cpp in versions before 4.3.3. This flaw allows a remote unauthenticated attacker to send crafted PUB messages that consume excessive memory if the CURVE/ZAP authentication is disabled on the server, causing a denial of service. The highest threat from this vulnerability is to system availability. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | ELA-1184-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| zeromq3 (PTS) | jessie, jessie (lts) | 4.0.5+dfsg-2+deb8u4 | fixed |
| stretch (security), stretch (lts), stretch | 4.2.1-4+deb9u4 | vulnerable |
| buster, buster (lts) | 4.3.1-4+deb10u3 | fixed |
| buster (security) | 4.3.1-4+deb10u2 | vulnerable |
| bullseye | 4.3.4-1+deb11u1 | fixed |
| bookworm | 4.3.4-6 | fixed |
| sid, trixie | 4.3.5-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| zeromq3 | source | jessie | (not affected) | | | |
| zeromq3 | source | buster | 4.3.1-4+deb10u3 | | ELA-1184-1 | |
| zeromq3 | source | (unstable) | 4.3.3-1 | | | |
Notes
[buster] - zeromq3 <no-dsa> (Minor issue)
[stretch] - zeromq3 <no-dsa> (Minor issue)
https://github.com/zeromq/libzmq/pull/3935
https://github.com/zeromq/libzmq/security/advisories/GHSA-4p5v-h92w-6wxw
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22344
[jessie] - zeromq3 <not-affected> (Vulnerable code introduced in 4.2.0)