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Routinator CVE-2023-39916

MEDIUM
Path Traversal: '.../...//' (CWE-35)
2023-09-13 sep@nlnetlabs.nl
6.5
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V5 - File Handling Path traversal prevention
Impact

CVSS score of 6.5 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required.

Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.5% exploitation probability (EPSS)

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AnalysisAI

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. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affected Packages

cargo routinator fix: 0.12.2

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in cargo

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-35. 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. Affected products include: Nlnetlabs Routinator.

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Severity by source

NVD PRIMARY 6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

DescriptionNVD

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.

Threat Intelligence Overview

EPSS Score
0.5%
Top 58% exploitable
Data Quality
2 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.5%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

33
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +32
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.

Affected Products (CPE)NVD

cpe:2.3:a:nlnetlabs:routinator:*:*:*:*:*:*:*:*
CVE-2020-17366 HIGH POC
7.4 Aug 05

An issue was discovered in NLnet Labs Routinator 0.1.0 through 0.7.1. Rated high severity (CVSS 7.4), this vulnerability

CVE-2026-49235 HIGH
8.7 Jun 08

Denial of service in NLnet Labs Routinator allows remote attackers to crash the RPKI validator by serving a crafted Docu

CVE-2026-49232 HIGH
8.7 Jun 08

Denial of service in NLnet Labs Routinator allows remote unauthenticated attackers to crash the daemon by opening a larg

CVE-2026-49233 HIGH
8.3 Jun 08

Path traversal in NLnet Labs Routinator allows remote attackers to escape the rsync cache directory by supplying rsync U

CVE-2026-49234 HIGH
8.2 Jun 08

Denial of service in NLnet Labs Routinator (an RPKI Relying Party software) allows remote attackers to crash the daemon

CVE-2026-72753 HIGH
8.2 Oct 26

Routinator, NLnet Labs' RPKI relying party validator, mishandles RRDP notification files by accepting delta entries with

CVE-2026-72758 HIGH
7.5 Oct 26

Routinator, NLnet Labs' RPKI relying-party validator, can be driven into memory exhaustion by an AS range in RPKI data w

CVE-2026-72756 HIGH
7.5 Oct 26

Routinator exits when it encounters an RRDP-delivered rsync URI whose path cannot be stored on disk, producing a denial

CVE-2026-72754 HIGH
7.5 Oct 26

Routinator, NLnet Labs' RPKI relying-party validator, can be hung or terminated by a CRL fetched from the repository hie

CVE-2024-1622 HIGH
7.5 Feb 26

Due to a mistake in error checking, Routinator will terminate when an incoming RTR connection is reset by the peer too q

CVE-2023-39915 HIGH
7.5 Sep 13

NLnet Labs' Routinator up to and including version 0.12.1 may crash when trying to parse certain malformed RPKI objects.

CVE-2022-3029 HIGH
7.5 Sep 13

In 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

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