PatchTheCVECVE-2023-38320: An issue was discovered in OpenNDS Captive Portal before version 10.1.2
CVE-2023-38320 is a high-severity flaw (CVSS 7.5) affecting captive portal. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An issue was discovered in OpenNDS Captive Portal before version 10.1.2. It has a show_preauthpage NULL pointer dereference that can be triggered with a crafted GET HTTP with a missing User-Agent header. Triggering this issue results in crashing OpenNDS (a Denial-of-Service condition). This problem was fixed in OpenWrt master, OpenWrt 23.05 and OpenWrt 22.03 on 28. August 2023 by updating OpenNDS to version 10.1.3.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.0% (top 39%) |
| CISA exploited list | No |
| Weakness | CWE-476 |
| Published | 2023-11-17 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2023-38320?
captive portal: upgrade to 10.1.2. Exact commands for each OS are on this page.
Is CVE-2023-38320 being exploited?
CVE-2023-38320 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2023-38320 affect?
CVE-2023-38320 affects captive portal. Severity is high (CVSS 7.5). An issue was discovered in OpenNDS Captive Portal before version 10.1.2. It has a show_preauthpage NULL pointer dereference that can be triggered with a crafted GET HTTP with a missing User-Agent header. Triggering this issue results in cra
How urgent is CVE-2023-38320?
Priority 47/100. High severity; Remotely exploitable, no login, no user action
Software pages
Related CVEs
- CVE-2023-38324 MEDIUM 5.3 UPGRADE An issue was discovered in OpenNDS before 10.1.2
- CVE-2023-38322 HIGH 7.5 UPGRADE An issue was discovered in OpenNDS Captive Portal before version 10.1.2
- CVE-2023-38316 CRITICAL 9.8 UPGRADE An issue was discovered in OpenNDS Captive Portal before version 10.1.2
- CVE-2023-38315 HIGH 7.5 UPGRADE An issue was discovered in OpenNDS Captive Portal before version 10.1.2
- CVE-2023-38314 MEDIUM 6.5 UPGRADE An issue was discovered in OpenNDS Captive Portal before version 10.1.2