CVE-2023-39916

Q: How do I fix CVE-2023-39916?

Upgrade routinator to 0.12.2 or later.

Q: Is CVE-2023-39916 being actively exploited?

Not that we know of. CVE-2023-39916 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.55% is the estimated probability that it will be exploited in the next 30 days. That is higher than 43% of all scored CVEs.

Q: How severe is CVE-2023-39916?

CVE-2023-39916 has a CVSS v3 base score of 9.3, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2023-39916 affect?

Published advisories record a fix for routinator (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICAL

9.3

CVSS v3

NVD

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.

CWE-35 CWE-22Path Traversal

How to fix

Remediation Available

routinatorNVD

Affected:>= 0.9.0, < 0.12.2Fixed in:0.12.2CVE-2023-39916derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H

Exploit Intelligence

0.55%probability of exploitation in 30 days

43rdpercentile

Moderate risk: more likely to be exploited than 43% of all known CVEs.

References

Vendor Advisory1

nlnetlabs.nl

Related Vulnerabilities

Other CWE-35 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-8088	High	8.8	95%	KEV + Ransom	Fix
CVE-2020-27130	Critical	9.1	66%	-	-
CVE-2024-2863	Medium	5.3	64%	-	-
CVE-2023-32714	High	8.1	43%	-	Fix
CVE-2024-36991	High	7.5	13%	-	Fix
CVE-2020-26073	High	7.5	12%	-	-

Common questions

How do I fix CVE-2023-39916?

Upgrade routinator to 0.12.2 or later.

Is CVE-2023-39916 being actively exploited?

Not that we know of. CVE-2023-39916 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.55% is the estimated probability that it will be exploited in the next 30 days. That is higher than 43% of all scored CVEs.

How severe is CVE-2023-39916?

CVE-2023-39916 has a CVSS v3 base score of 9.3, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2023-39916 affect?

Published advisories record a fix for routinator (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-03.