CVE-2021-23017
7.7 · HIGHOverview
CVE-2021-23017 is a high-severity vulnerability affecting f5 nginx. It was published on June 1, 2021 and has a CVSS 3.1 base score of 7.7 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from f5. Update nginx to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| f5 | nginx | >= 0.6.18, < 1.20.1 | Affected |
| openresty | openresty | >= 0, < 1.19.3.2 | Affected |
| oracle | blockchain_platform | >= 0, < 21.1.2 | Affected |
| oracle | communications_fraud_monitor | 3.4 | Affected |
| oracle | goldengate | >= 0, < 21.4.0.0.0 | Affected |
References
Frequently Asked Questions
What is CVE-2021-23017?
CVE-2021-23017 is a high-severity vulnerability affecting f5 nginx. It was published on June 1, 2021 and has a CVSS 3.1 base score of 7.7 (HIGH).
How severe is CVE-2021-23017?
This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-23017?
Check the references section for vendor advisories and patches from f5. Update nginx to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-23017?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-23017 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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