HOMEVULNERABILITIESCVE-2023-38320
HIGH

CVE-2023-38320

CWE-476Published: November 17, 2023· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2023-38320 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

opennds1 product(s)
captive portal
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttps://github.com/openNDS/openNDS/releases/tag/v10.1.2
ADVISORYhttps://github.com/openNDS/openNDS/releases/tag/v10.1.2

All References (6)

→
https://github.com/openNDS/openNDS/releases/tag/v10.1.2Release Notes · Vendor Advisory
→
https://github.com/openwrt/routing/commit/0b19771fb2dd81e7c428759610aed583171eed80
→
https://source.sierrawireless.com/resources/security-bulletins/sierra-wireless-technical-bulletin---swi-psa-2023-006/#sthash.2vJg3d85.dpbs
→
https://github.com/openNDS/openNDS/releases/tag/v10.1.2Release Notes · Vendor Advisory
→
https://github.com/openwrt/routing/commit/0b19771fb2dd81e7c428759610aed583171eed80
→
https://source.sierrawireless.com/resources/security-bulletins/sierra-wireless-technical-bulletin---swi-psa-2023-006/#sthash.2vJg3d85.dpbs

Quick Facts

CVE IDCVE-2023-38320
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-476
CISA KEVNo
Affected1 vendor(s)
PublishedNov 17, 2023

Related CVEs (CWE-476)

CVE-2010-2495
10.0
CVE-2022-36648
10.0
CVE-2021-28300
9.8
CVE-2015-8787
9.8
CVE-2017-7614
9.8
CVE-2016-6604
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-38320 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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