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    Dashboard / CVE / CVE-2021-23017

    CVE-2021-23017

    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.

    Published:May 25, 2021
    Last Modified:Nov 21, 2024
    EPS:Jun 1, 2021
    EPSS Score:0.79436
    CVSS Score:7.7

    Affected Products

    Vendor
    F5
    Product
    Nginx
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Netapp
    Product
    Ontap Select Deploy Administration Utility
    Vendor
    Openresty
    Product
    Openresty
    Vendor
    Oracle
    Product
    Blockchain Platform
    Vendor
    Oracle
    Product
    Communications Control Plane Monitor
    Vendor
    Oracle
    Product
    Communications Fraud Monitor
    Vendor
    Oracle
    Product
    Communications Operations Monitor
    Vendor
    Oracle
    Product
    Communications Session Border Controller
    Vendor
    Oracle
    Product
    Enterprise Communications Broker
    Vendor
    Oracle
    Product
    Enterprise Session Border Controller
    Vendor
    Oracle
    Product
    Enterprise Telephony Fraud Monitor
    Vendor
    Oracle
    Product
    Goldengate
    Vendor
    Redhat
    Product
    3scale Amp
    Vendor
    Redhat
    Product
    Acm
    Vendor
    Redhat
    Product
    Ansible Automation Platform
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Software Collections

    Exploits

    https://www.exploit-db.com/exploits/50973https://github.com/6lj/EVIL-CVE-2021-23017-Update-2025https://github.com/Cybervixy/Vulnerability-Managementhttps://github.com/lakshit1212/CVE-2021-23017-PoChttps://github.com/lukwagoasuman/-home-lukewago-Downloads-CVE-2021-23017-Nginx-1.14https://github.com/M507/CVE-2021-23017-PoChttps://github.com/moften/CVE-2021-23017https://github.com/niandy/nginx-patchhttps://github.com/ShivamDey/CVE-2021-23017https://github.com/z3usx01/CVE-2021-23017-POC

    Common Weakness Enumeration

    CWE-193 Off-by-one Error

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2025-23419 (CVSS 5.3) — When multiple server blocks are configured to share the same IP address and port, an attacker can use session …
    CVE-2024-35200 (CVSS 5.3) — When NGINX Plus or NGINX OSS are configured to use the HTTP/3 QUIC module, undisclosed HTTP/3 requests can cau…
    CVE-2024-34161 (CVSS 5.3) — When NGINX Plus or NGINX OSS are configured to use the HTTP/3 QUIC module and the network infrastructure suppo…
    CVE-2024-32760 (CVSS 6.5) — When NGINX Plus or NGINX OSS are configured to use the HTTP/3 QUIC module, undisclosed HTTP/3 encoder instruct…
    CVE-2023-44487 (CVSS 7.5) — The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can …
    CVE-2022-41741 (CVSS 7) — NGINX Open Source before versions 1.23.2 and 1.22.1, NGINX Open Source Subscription before versions R2 P1 and …
    CVE-2022-41742 (CVSS 7.1) — NGINX Open Source before versions 1.23.2 and 1.22.1, NGINX Open Source Subscription before versions R2 P1 and …
    CVE-2021-3618 (CVSS 7.4) — ALPACA is an application layer protocol content confusion attack, exploiting TLS servers implementing differen…
    CVE-2019-20372 (CVSS 5.3) — NGINX before 1.17.7, with certain error_page configurations, allows HTTP request smuggling, as demonstrated by…
    CVE-2011-4968 (CVSS 4.8) — nginx http proxy module does not verify peer identity of https origin server which could facilitate man-in-the…

    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
    https://lists.apache.org/thread.html/rf232eecd47fdc44520192810560303073cefd684b321f85e311bad31%40%3Cnotifications.apisix.apache.org%3E
    https://lists.apache.org/thread.html/rf318aeeb4d7a3a312734780b47de83cefb7e6995da0b2cae5c28675c%40%3Cnotifications.apisix.apache.org%3E
    https://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%2C
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujan2022.html
    https://www.oracle.com/security-alerts/cpuoct2021.html
    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
    https://lists.apache.org/thread.html/rf232eecd47fdc44520192810560303073cefd684b321f85e311bad31%40%3Cnotifications.apisix.apache.org%3E
    https://lists.apache.org/thread.html/rf318aeeb4d7a3a312734780b47de83cefb7e6995da0b2cae5c28675c%40%3Cnotifications.apisix.apache.org%3E
    https://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%2C
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujan2022.html
    https://www.oracle.com/security-alerts/cpuoct2021.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High