CVE-2021-20305
8.1 · HIGHOverview
CVE-2021-20305 is a high-severity vulnerability affecting nettle_project nettle. It was published on April 5, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.
Remediation
Check the references section for vendor advisories and patches from nettle_project. Update nettle 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 |
|---|---|---|---|
| nettle_project | nettle | >= 0, < 3.7.2 | Affected |
References
Frequently Asked Questions
What is CVE-2021-20305?
CVE-2021-20305 is a high-severity vulnerability affecting nettle_project nettle. It was published on April 5, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2021-20305?
This vulnerability has a CVSS 3.1 base score of 8.1, 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-2021-20305?
Check the references section for vendor advisories and patches from nettle_project. Update nettle 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-2021-20305?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-20305 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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