Vulnerability · Published May 28, 2021 · Assigned by redhat
CVE-2021-20236
Critical 9.8
In plain English
A critical-severity buffer overflow in zeromq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.9% (higher than 79% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)1.9%top 20.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | zeromq3 | 4.3.3-1 | DEBIAN-CVE-2021-20236 |
| Debian:13 | zeromq3 | 4.3.3-1 | DEBIAN-CVE-2021-20236 |
| Debian:14 | zeromq3 | 4.3.3-1 | DEBIAN-CVE-2021-20236 |
Affected products (as reported)
Weakness: CWE-120
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1921976 x_refsource_MISC
- https://github.com/zeromq/libzmq/security/advisories/GHSA-qq65-x72m-9wr8 x_refsource_MISC