CVE-2021-23017
40Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendepss 53%
from disclosure to weapon199 days
Published on NVDJun 1
1st PoC+199d
exploitation probability
53%top 1% of all CVEs
observed exploitation
nono source reports it
11 public exploit(s)
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.
Affected products
n/a · Nginx Web Server, Nginx Pluspublic PoCs found — 11
exploitdbwww.exploit-db.com/exploits/50973unverifiedgithubgithub.com/M507/CVE-2021-23017-PoC★ 135githubgithub.com/lakshit1212/CVE-2021-23017-PoC★ 1githubgithub.com/z3usx01/CVE-2021-23017-POC★ 1githubgithub.com/niandy/nginx-patch★ 1githubgithub.com/6lj/EVIL-CVE-2021-23017-Update-2025★ 1githubgithub.com/lukwagoasuman/-home-lukewago-Downloads-CVE-2021-23017-Nginx-1.14★ 0githubgithub.com/Cybervixy/Vulnerability-Management★ 0githubgithub.com/moften/CVE-2021-23017★ 0githubgithub.com/ShivamDey/CVE-2021-23017★ 0cve_referencepacketstormsecurity.com/files/167720/Nginx-1.20.0-Denial-Of-Service.htmlunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
http://mailman.nginx.org/pipermail/nginx-announce/2021/000300.htmlhttp://packetstormsecurity.com/files/167720/Nginx-1.20.0-Denial-Of-Service.htmlhttps://lists.apache.org/thread.html/r37e6b2165f7c910d8e15fd54f4697857619ad2625f56583802004009%40%3Cnotifications.apisix.apache.org%3Ehttps://lists.apache.org/thread.html/r4d4966221ca399ce948ef34884652265729d7d9ef8179c78d7f17e7f%40%3Cnotifications.apisix.apache.org%3Ehttps://lists.apache.org/thread.html/r6fc5c57b38e93e36213e9a18c8a4e5dbd5ced1c7e57f08a1735975ba%40%3Cnotifications.apisix.apache.org%3Ehttps://lists.apache.org/thread.html/rf232eecd47fdc44520192810560303073cefd684b321f85e311bad31%40%3Cnotifications.apisix.apache.org%3Ehttps://lists.apache.org/thread.html/rf318aeeb4d7a3a312734780b47de83cefb7e6995da0b2cae5c28675c%40%3Cnotifications.apisix.apache.org%3Ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7SFVYHC7OXTEO4SMBWXDVK6E5IMEYMEE/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNKOP2JR5L7KCIZTJRZDCUPJTUONMC5I/https://security.netapp.com/advisory/ntap-20210708-0006/https://support.f5.com/csp/article/K12331123%2Chttps://www.oracle.com/security-alerts/cpuapr2022.html