VulnerabilityModified
CVE-2021-20236
This flaw allows a malicious client to cause a stack buffer overflow on the server by sending crafted topic subscription requests and then unsubscribing.
CRITICAL 9.8EPSS 1.60%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.60%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.60% probability · 74th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-120, CWE-787
- Affected
- zeromq/zeromq · redhat/ceph storage · redhat/enterprise linux · fedoraproject/fedora
- Source
- secalert@redhat.com
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1921976Issue Tracking, Third Party Advisory
- https://github.com/zeromq/libzmq/security/advisories/GHSA-qq65-x72m-9wr8Patch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1921976Issue Tracking, Third Party Advisory
- https://github.com/zeromq/libzmq/security/advisories/GHSA-qq65-x72m-9wr8Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.