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Vulnerability record · CVE-2021-41531 · published 21 September 2021

CVE-2021-41531: Nlnetlabs routinator improper input validation vulnerability

Nlnetlabs · Routinator

NLnet Labs Routinator prior to 0.10.0 produces invalid RTR payload if an RPKI CA uses too large values in the max-length parameter in a ROA. This will lead to RTR clients such as routers to reject the RPKI data set, effectively disabling Route Origin Validation.

7.5 CVSS 3.1 High EPSS 0.93% · top 40.5% CWE-1288 · CWE-1288CWE-20 · Improper input validation
7.5CVSS 3.1 base score, v2 5.0
0.93%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

NLnet Labs Routinator prior to 0.10.0 produces invalid RTR payload if an RPKI CA uses too large values in the max-length parameter in a ROA. This will lead to RTR clients such as routers to reject the RPKI data set, effectively disabling Route Origin Validation.

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

Affected products

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

References

LinkTags
https://www.nlnetlabs.nl/downloads/routinator/CVE-2021-41531.txt Vendor Advisory
https://www.nlnetlabs.nl/downloads/routinator/CVE-2021-41531.txt Vendor 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-2021-43172Nlnetlabs 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%7.5CVE-2021-43173Nlnetlabs routinator uncontrolled resource consumption vulnerabilityIn NLnet Labs Routinator prior to 0.10.2, a validation run can be delayed significantly by an RRDP repository by not answering but slowly drip-feedin…EPSS 1.5%

Source: NIST National Vulnerability Database (record CVE-2021-41531), CISA KEV, FIRST EPSS (scores of 2026-10-10). This page is refreshed as NVD updates the record.