High severity7.7NVD Advisory· Published Jun 1, 2021· Updated Jun 17, 2026
CVE-2021-23017
CVE-2021-23017
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
54- cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:blockchain_platform:*:*:*:*:*:*:*:*Range: <21.1.2
cpe:2.3:a:oracle:communications_control_plane_monitor:3.4:*:*:*:*:*:*:*+ 3 more
- cpe:2.3:a:oracle:communications_control_plane_monitor:3.4:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_control_plane_monitor:4.2:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_control_plane_monitor:4.3:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_control_plane_monitor:4.4:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_fraud_monitor:*:*:*:*:*:*:*:*Range: >=3.4,<=4.4
cpe:2.3:a:oracle:communications_operations_monitor:3.4:*:*:*:*:*:*:*+ 3 more
- cpe:2.3:a:oracle:communications_operations_monitor:3.4:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_operations_monitor:4.2:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_operations_monitor:4.3:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_operations_monitor:4.4:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_session_border_controller:8.4:*:*:*:*:*:*:*+ 3 more
- cpe:2.3:a:oracle:communications_session_border_controller:8.4:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_session_border_controller:9.0:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:enterprise_session_border_controller:8.4:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:enterprise_session_border_controller:9.0:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:enterprise_communications_broker:3.3.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:enterprise_telephony_fraud_monitor:3.4:*:*:*:*:*:*:*+ 3 more
- cpe:2.3:a:oracle:enterprise_telephony_fraud_monitor:3.4:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:enterprise_telephony_fraud_monitor:4.2:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:enterprise_telephony_fraud_monitor:4.3:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:enterprise_telephony_fraud_monitor:4.4:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- nginx/nginx resolverdescription
- osv-coords28 versionspkg:bitnami/nginxpkg:bitnami/nginx-gatewaypkg:rpm/almalinux/nginxpkg:rpm/almalinux/nginx-all-modulespkg:rpm/almalinux/nginx-filesystempkg:rpm/almalinux/nginx-mod-http-image-filterpkg:rpm/almalinux/nginx-mod-http-perlpkg:rpm/almalinux/nginx-mod-http-xslt-filterpkg:rpm/almalinux/nginx-mod-mailpkg:rpm/almalinux/nginx-mod-streampkg:rpm/opensuse/nginx&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/nginx&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/nginx&distro=openSUSE%20Tumbleweedpkg:rpm/suse/nginx&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/suse/nginx&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/nginx&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/nginx&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/nginx&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/nginx&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP2pkg:rpm/suse/nginx&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP3pkg:rpm/suse/nginx&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/nginx&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/suse/nginx&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/nginx&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/nginx&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/nginx&distro=SUSE%20Manager%20Proxy%204.0pkg:rpm/suse/nginx&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.0pkg:rpm/suse/nginx&distro=SUSE%20Manager%20Server%204.0
>= 0.6.18, < 1.20.1+ 27 more
- (no CPE)range: >= 0.6.18, < 1.20.1
- (no CPE)range: >= 0.6.18, < 1.20.1
- (no CPE)range: < 1:1.18.0-3.module_el8.5.0+36+48437aab.1.alma
- (no CPE)range: < 1:1.18.0-3.module_el8.4.0+2472+f736ed63.1.alma
- (no CPE)range: < 1:1.18.0-3.module_el8.4.0+2472+f736ed63.1.alma
- (no CPE)range: < 1:1.18.0-3.module_el8.4.0+2472+f736ed63.1.alma
- (no CPE)range: < 1:1.18.0-3.module_el8.4.0+2472+f736ed63.1.alma
- (no CPE)range: < 1:1.18.0-3.module_el8.5.0+36+48437aab.1.alma
- (no CPE)range: < 1:1.18.0-3.module_el8.5.0+36+48437aab.1.alma
- (no CPE)range: < 1:1.18.0-3.module_el8.4.0+2472+f736ed63.1.alma
- (no CPE)range: < 1.16.1-lp152.2.3.1
- (no CPE)range: < 1.19.8-3.3.1
- (no CPE)range: < 1.21.3-1.4
- (no CPE)range: < 1.16.1-6.13.1
- (no CPE)range: < 1.16.1-6.13.1
- (no CPE)range: < 1.16.1-6.13.1
- (no CPE)range: < 1.16.1-3.15.1
- (no CPE)range: < 1.16.1-3.15.1
- (no CPE)range: < 1.16.1-3.3.1
- (no CPE)range: < 1.19.8-3.3.1
- (no CPE)range: < 1.16.1-6.13.1
- (no CPE)range: < 1.16.1-6.13.1
- (no CPE)range: < 1.16.1-3.15.1
- (no CPE)range: < 1.16.1-3.15.1
- (no CPE)range: < 1.16.1-6.13.1
- (no CPE)range: < 1.16.1-6.13.1
- (no CPE)range: < 1.16.1-6.13.1
- (no CPE)range: < 1.16.1-6.13.1
Patches
Vulnerability mechanics
References
14- mailman.nginx.org/pipermail/nginx-announce/2021/000300.htmlnvdMailing ListPatchVendor Advisory
- www.oracle.com/security-alerts/cpuapr2022.htmlnvdPatchThird Party Advisory
- www.oracle.com/security-alerts/cpujan2022.htmlnvdPatchThird Party Advisory
- www.oracle.com/security-alerts/cpuoct2021.htmlnvdPatchThird Party Advisory
- packetstormsecurity.com/files/167720/Nginx-1.20.0-Denial-Of-Service.htmlnvdThird Party AdvisoryVDB Entry
- security.netapp.com/advisory/ntap-20210708-0006/nvdThird Party Advisory
- lists.apache.org/thread.html/r37e6b2165f7c910d8e15fd54f4697857619ad2625f56583802004009%40%3Cnotifications.apisix.apache.org%3Envd
- lists.apache.org/thread.html/r4d4966221ca399ce948ef34884652265729d7d9ef8179c78d7f17e7f%40%3Cnotifications.apisix.apache.org%3Envd
- lists.apache.org/thread.html/r6fc5c57b38e93e36213e9a18c8a4e5dbd5ced1c7e57f08a1735975ba%40%3Cnotifications.apisix.apache.org%3Envd
- lists.apache.org/thread.html/rf232eecd47fdc44520192810560303073cefd684b321f85e311bad31%40%3Cnotifications.apisix.apache.org%3Envd
- lists.apache.org/thread.html/rf318aeeb4d7a3a312734780b47de83cefb7e6995da0b2cae5c28675c%40%3Cnotifications.apisix.apache.org%3Envd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7SFVYHC7OXTEO4SMBWXDVK6E5IMEYMEE/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNKOP2JR5L7KCIZTJRZDCUPJTUONMC5I/nvd
- support.f5.com/csp/article/K12331123%2Cnvd
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