vulnerability
FreeBSD: VID-0882f019-bd60-11eb-9bdd-8c164567ca3c (CVE-2021-23017): NGINX -- 1-byte memory overwrite in resolver
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:N/AC:M/Au:N/C:P/I:P/A:P) | May 25, 2021 | Nov 4, 2022 | Jun 15, 2026 |
Severity
7
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:P)
Published
May 25, 2021
Added
Nov 4, 2022
Modified
Jun 15, 2026
Description
A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact.
Solutions
freebsd-upgrade-package-nginxfreebsd-upgrade-package-nginx-devel
Rapid7 Labs
2026 Global Threat Landscape Report
The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.