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TI-2021-19186 Aliases CVE-2021-43172GHSA-m3x9-623g-35c4

Infinite length chain of RRDP repositories

Priority LOW 35CWE-674Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-674.

Summary

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.

Why it matters now

EPSS 0.01104 65th percentileScored 2026-11-07
Fix Fixed routinator (crates.io): 0.10.2

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
NLnet LabsRoutinatorup to 0.10.1—No fix listedCNA
—routinator (crates.io)before 0.10.20.10.2Patch availableGHSA-m3x9-623g-35c4
  • Routinator VendorNLnet Labs Affected up to 0.10.1 Fixed in — No fix listed CNA
  • routinator (crates.io) Vendor— Affected before 0.10.2 Fixed in 0.10.2 Patch available GHSA-m3x9-623g-35c4

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nlnetlabs:routinator:*:*:*:*:*:*:*:*before 0.10.2VulnerableNLNETLABS
  • cpe:2.3:a:nlnetlabs:routinator:*:*:*:*:*:*:*:* Versions before 0.10.2 Vulnerable ·NLNETLABS

Remediation

  • Fix · GHSA-m3x9-623g-35c4 routinator (crates.io) Fixed in 0.10.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43172
  2. 2026-10-03 Alias added: GHSA-m3x9-623g-35c4

References

Advisory 2

Other 1

  • TI-2026-25690 Possible arbitrary code execution during DNSSEC validation CVSS 4.0CRITICAL 9.1
  • TI-2026-56302 Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY CVSS 4.0CRITICAL 9.1
  • TI-2026-31146 Crash during DNSSEC validation of malicious content CVSS 4.0HIGH 8.7
  • TI-2026-31135 Heap overflow with multiple NSID, COOKIE, PADDING EDNS options CVSS 4.0HIGH 8.7
  • TI-2026-36436 Routinator crashes on specifically crafted RRDP XML files CVSS 4.0HIGH 8.7
  • TI-2026-36433 Routinator exits when accepting an incoming HTTP or RTR connection fails CVSS 4.0HIGH 8.7
See all 96 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences