How severe is CVE-2023-39916?

CVE-2023-39916 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2023-39916 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-39916?

CVE-2023-39916 affects Nlnetlabs Routinator. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-39916?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-39916 published?

CVE-2023-39916 was published on 2023-09-13 and last updated on 2026-06-17.

CVE-2023-39916

CVE-2023-39916 is a critical-severity vulnerability in Nlnetlabs Routinator with a CVSS 3.x base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.3)
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Nlnetlabs Routinator
Published: 2023-09-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-39916?: 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.
How severe is CVE-2023-39916?: CVE-2023-39916 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2023-39916 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-39916?: CVE-2023-39916 affects Nlnetlabs Routinator. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-39916?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-39916 published?: CVE-2023-39916 was published on 2023-09-13 and last updated on 2026-06-17.

References

https://nlnetlabs.nl/downloads/routinator/CVE-2023-39916.txt

Affected products (1)

cpe:2.3:a:nlnetlabs:routinator:*:*:*:*:*:*:*:*

More vulnerabilities in Nlnetlabs Routinator

CVE-2026-49235 — High (CVSS 7.5): When Routinator encounters a file via RRDP using a specifically crafted Document Type Definition, Routinator crashes.
CVE-2026-49234 — High (CVSS 7.5): When sending a specifically crafted non-UTF-8 string as select-asn query parameter to the /api/v1/origins endpoint,…
CVE-2026-49233 — High (CVSS 7.5): Routinator does not properly check the module component of rsync URIs, which are used to create the file system paths…
CVE-2024-1622 — High (CVSS 7.5): Due to a mistake in error checking, Routinator will terminate when an incoming RTR connection is reset by the peer too…
CVE-2023-39915 — High (CVSS 7.5): NLnet Labs' Routinator up to and including version 0.12.1 may crash when trying to parse certain malformed RPKI…
CVE-2022-3029 — High (CVSS 7.5): 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…

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