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VulnerabilityPublished Updated

CVE-2023-39916: NLnet Labs Routinator · Path Traversal: '.../...//

Affects NLnet Labs RoutinatorSource CVE Database V5

0

Not known to be exploited · CVSS 9.3 Critical : upgrade to 0.15.0 as a priority.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score
9.3Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 50% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.15.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Sep 2023

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade NLnet Labs Routinator to 0.15.0.

Affected software

ProductAffectedFixed in
NLnet Labs RoutinatorAffected
  • =0.9.0
  • >=0.14.0 <0.15.0
Fixed in
  • 0.15.0

AI-suggested

  1. Immediately upgrade Routinator to a version where this vulnerability is patched once available. Monitor NLnet Labs announcements for official fixes.
  2. Disable the 'keep-rrdp-responses' feature if it is not essential to your operations, as it is off by default and the vulnerability resides in this optional feature.
  3. Implement strict input validation and sanitization on URLs processed by Routinator, if customization is possible, to prevent path traversal sequences.
  4. Run Routinator with least privilege, ensuring it operates under a dedicated user account with limited filesystem permissions, restricting its ability to write outside designated directories.
  5. Employ filesystem monitoring tools to detect unexpected file writes or modifications outside the expected directories used by Routinator.
  6. Use containerization or sandboxing techniques to isolate Routinator processes, limiting the impact of potential exploitation.
  7. Regularly audit and monitor logs for unusual RRDP request URLs or file system activity that could indicate exploitation attempts.
  8. Coordinate with network operations and security teams to prepare incident response plans in case of exploitation, including rapid rollback and system restoration procedures.

Description

NLnet Labs’ Routinator 0.9.0 up to and including 0.12.1 as well as 0.14.0 up to and including 0.14.2 contains a possible path traversal vulnerability in the optional, off-by-default keep-rrdp-responses feature that allows users to store the content of responses received for RRDP requests. The location of these stored responses is constructed from the URL of the request. Due to insufficient sanitation of the URL, it is possible for an attacker to craft a URL that results in the response being stored outside of the directory specified for it.

References

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