CVSS 3.1
7.7 highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:LCVE-2021-23017
High (7.7). EPSS 53% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 53% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-31)
- CWE
- CWE-193
- Published
- Modified
- Record from
- the NVD, synced
Affected
- f5:nginx
- fedoraproject:fedora
- netapp:ontap_select_deploy_administration_utility
- openresty:openresty
- oracle:blockchain_platform
- oracle:communications_control_plane_monitor
- oracle:communications_fraud_monitor
- oracle:communications_operations_monitor
- oracle:communications_session_border_controller
- oracle:enterprise_communications_broker
- oracle:enterprise_session_border_controller
- oracle:enterprise_telephony_fraud_monitor
- oracle:goldengate
References
- http://mailman.nginx.org/pipermail/nginx-announce/2021/000300.html
- http://packetstormsecurity.com/files/167720/Nginx-1.20.0-Denial-Of-Service.html
- https://lists.apache.org/thread.html/r37e6b2165f7c910d8e15fd54f4697857619ad2625f56583802004009%40%3Cnotifications.apisix.apache.org%3E
- https://lists.apache.org/thread.html/r4d4966221ca399ce948ef34884652265729d7d9ef8179c78d7f17e7f%40%3Cnotifications.apisix.apache.org%3E
- https://lists.apache.org/thread.html/r6fc5c57b38e93e36213e9a18c8a4e5dbd5ced1c7e57f08a1735975ba%40%3Cnotifications.apisix.apache.org%3E