CVE-2021-43172
7.5 · HIGHOverview
CVE-2021-43172 is a high-severity vulnerability affecting nlnetlabs routinator. It was published on November 9, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
NLnet Labs Routinator prior to 0.10.2 happily processes a chain of RRDP repositories of infinite length causing it to never finish a validation run. In RPKI, a CA can choose the RRDP repository it wishes to publish its data in. By continuously generating a new child CA that only consists of another CA using a different RRDP repository, a malicious CA can create a chain of CAs of de-facto infinite length. Routinator prior to version 0.10.2 did not contain a limit on the length of such a chain and will therefore continue to process this chain forever. As a result, the validation run will never finish, leading to Routinator continuing to serve the old data set or, if in the initial validation run directly after starting, never serve any data at all.
Remediation
Check the references section for vendor advisories and patches from nlnetlabs. Update routinator 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 |
|---|---|---|---|
| nlnetlabs | routinator | >= 0, < 0.10.2 | Affected |
Frequently Asked Questions
What is CVE-2021-43172?
CVE-2021-43172 is a high-severity vulnerability affecting nlnetlabs routinator. It was published on November 9, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2021-43172?
This vulnerability has a CVSS 3.1 base score of 7.5, 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-2021-43172?
Check the references section for vendor advisories and patches from nlnetlabs. Update routinator 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-2021-43172?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-43172 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
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