Invalid RPKI data could disable Route Origin Validation on RTR clients.

published 2021-09-21 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-28550

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

nlnetlabs routinator 0.10.0

Exploit prediction

0.93% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

NLnet Labs Routinator

Classification

Weakness

CWE-1288 Improper Validation of Consistency within Input
CWE-20 Improper Input Validation

References

nlnetlabs.nl /downloads/routinator/CVE-2021-41531.txt
vendor-advisory

Sources

CVE List CVE-2021-41531
NVD CVE-2021-41531

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Summary