CVE-2021-41531 Invalid RPKI data could disable Route Origin Validation on RTR clients.
Attackers can disable Route Origin Validation on routers by causing Routinator to produce invalid RTR payloads, bypassing RPKI security checks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-41531?
CVE-2021-41531 is a high-severity denial of service vulnerability in NLnet Labs Routinator, published on 21 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2021-41531?
It affects 1 product.
Products include Nlnetlabs Routinator.
How do I fix CVE-2021-41531?
No fix has been published for CVE-2021-41531 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-41531 being exploited?
There is no known exploitation of CVE-2021-41531 in the wild and no public exploit code.
Other vulnerabilities in NLnet Labs Routinator
- CVE-2023-39916 Possible path traversal when storing RRDP responses
- CVE-2026-49235 Routinator crashes on specifically crafted RRDP XML files
- CVE-2026-49233 Routinator cache path traversal using rogue rsync URIs
- CVE-2026-49234 Routinator crashes on specifically crafted ASN strings in the API
- CVE-2023-39915 Crashes on parsing certain invalid RPKI objects
Sources
Also known as GHSA-mjc7-fwvm-67h4.