vulnerability
Ubuntu: (Multiple Advisories) (CVE-2021-23017): nginx vulnerability
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:N/AC:M/Au:N/C:P/I:P/A:P) | May 26, 2021 | May 27, 2021 | Apr 16, 2026 |
Severity
7
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:P)
Published
May 26, 2021
Added
May 27, 2021
Modified
Apr 16, 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
ubuntu-pro-upgrade-nginxubuntu-pro-upgrade-nginx-commonubuntu-pro-upgrade-nginx-coreubuntu-pro-upgrade-nginx-extrasubuntu-pro-upgrade-nginx-fullubuntu-pro-upgrade-nginx-lightubuntu-upgrade-nginxubuntu-upgrade-nginx-commonubuntu-upgrade-nginx-coreubuntu-upgrade-nginx-extrasubuntu-upgrade-nginx-fullubuntu-upgrade-nginx-light
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.