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Vulnerability record · CVE-2020-17366 · published 5 August 2020

CVE-2020-17366: Nlnetlabs routinator improper certificate validation vulnerability

Nlnetlabs · Routinator

An issue was discovered in NLnet Labs Routinator 0.1.0 through 0.7.1. It allows remote attackers to bypass intended access restrictions or to cause a denial of service on dependent routing systems by strategically withholding RPKI Route Origin Authorisation ".roa" files or X509 Certificate Revocation List files from the RPKI relying party's view.

7.4 CVSS 3.1 High EPSS 0.75% · top 46.4% CWE-295 · Improper certificate validation
7.4CVSS 3.1 base score, v2 5.8
0.75%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered in NLnet Labs Routinator 0.1.0 through 0.7.1. It allows remote attackers to bypass intended access restrictions or to cause a denial of service on dependent routing systems by strategically withholding RPKI Route Origin Authorisation ".roa" files or X509 Certificate Revocation List files from the RPKI relying party's view.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/NLnetLabs/routinator/issues/319 ExploitIssue TrackingThird Party Advisory
https://github.com/NLnetLabs/routinator/releases/tag/v0.8.0 Release NotesThird Party Advisory
https://github.com/NLnetLabs/routinator/issues/319 ExploitIssue TrackingThird Party Advisory
https://github.com/NLnetLabs/routinator/releases/tag/v0.8.0 Release NotesThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.7CVE-2026-49235Nlnetlabs routinator vulnerabilityWhen Routinator encounters a file via RRDP using a specifically crafted Document Type Definition, Routinator crashes.EPSS 0.46%8.3CVE-2026-49233Nlnetlabs routinator path traversal vulnerabilityRoutinator does not properly check the module component of rsync URIs, which are used to create the file system paths for the Routinator cache. This …EPSS 0.50%8.2CVE-2026-49234Nlnetlabs routinator improper input validation vulnerabilityWhen sending a specifically crafted non-UTF-8 string as select-asn query parameter to the /api/v1/origins endpoint, Routinator crashes. This only aff…EPSS 0.33%7.5CVE-2024-1622Nlnetlabs routinator vulnerabilityDue to a mistake in error checking, Routinator will terminate when an incoming RTR connection is reset by the peer too quickly after opening.EPSS 1.0%7.5CVE-2023-39915Nlnetlabs routinator vulnerabilityNLnet Labs' Routinator up to and including version 0.12.1 may crash when trying to parse certain malformed RPKI objects. This is due to insufficient …EPSS 0.62%7.5CVE-2022-3029Nlnetlabs routinator vulnerabilityIn NLnet Labs Routinator 0.9.0 up to and including 0.11.2, due to a mistake in error handling, data in RRDP snapshot and delta files that isn’t corre…EPSS 0.94%7.5CVE-2021-43174Nlnetlabs routinator out-of-bounds write vulnerabilityNLnet Labs Routinator versions 0.9.0 up to and including 0.10.1, support the gzip transfer encoding when querying RRDP repositories. This encoding ca…EPSS 1.2%7.5CVE-2021-43172Nlnetlabs routinator vulnerabilityNLnet 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. …EPSS 1.3%

Source: NIST National Vulnerability Database (record CVE-2020-17366), CISA KEV, FIRST EPSS (scores of 2026-10-12). This page is refreshed as NVD updates the record.