How severe is CVE-2023-38316?

CVE-2023-38316 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-38316 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-38316?

CVE-2023-38316 affects Opennds Captive Portal. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-38316?

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-2023-38316 published?

CVE-2023-38316 was published on 2023-11-17 and last updated on 2026-06-17.

CVE-2023-38316

CVE-2023-38316 is a critical-severity vulnerability in Opennds Captive Portal with a CVSS 3.x base score of 9.8. 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-116.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-116
Affected product: Opennds Captive Portal
Published: 2023-11-17
Last modified: 2026-06-17

Description

An issue was discovered in OpenNDS Captive Portal before version 10.1.2. When the custom unescape callback is enabled, attackers can execute arbitrary OS commands by inserting them into the URL portion of HTTP GET requests. Affected OpenNDS Captive Portal before version 10.1.2 fixed in OpenWrt master, OpenWrt 23.05 and OpenWrt 22.03 on 28. August 2023 by updating OpenNDS to version 10.1.3.

Frequently asked questions

What is CVE-2023-38316?: An issue was discovered in OpenNDS Captive Portal before version 10.1.2. When the custom unescape callback is enabled, attackers can execute arbitrary OS commands by inserting them into the URL portion of HTTP GET requests. Affected OpenNDS Captive Portal before version 10.1.2 fixed in OpenWrt master, OpenWrt 23.05 and OpenWrt 22.03 on 28. August 2023 by updating OpenNDS to version 10.1.3.
How severe is CVE-2023-38316?: CVE-2023-38316 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-38316 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-38316?: CVE-2023-38316 affects Opennds Captive Portal. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-38316?: 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-2023-38316 published?: CVE-2023-38316 was published on 2023-11-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:opennds:captive_portal:*:*:*:*:*:*:*:*

More vulnerabilities in Opennds Captive Portal

CVE-2023-38322 — High (CVSS 7.5): An issue was discovered in OpenNDS Captive Portal before version 10.1.2. It has a do_binauth NULL pointer dereference…
CVE-2023-38320 — High (CVSS 7.5): An issue was discovered in OpenNDS Captive Portal before version 10.1.2. It has a show_preauthpage NULL pointer…
CVE-2023-38315 — High (CVSS 7.5): An issue was discovered in OpenNDS Captive Portal before version 10.1.2. It has a try_to_authenticate NULL pointer…
CVE-2023-38313 — High (CVSS 7.5): An issue was discovered in OpenNDS Captive Portal before 10.1.2. it has a do_binauth NULL pointer dereference that can…
CVE-2023-38314 — Medium (CVSS 6.5): An issue was discovered in OpenNDS Captive Portal before version 10.1.2. It has a NULL pointer dereference in…
CVE-2023-38324 — Medium (CVSS 5.3): An issue was discovered in OpenNDS before 10.1.2. It allows users to skip the splash page sequence (and directly…

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