CVE-2023-38313Network attack vector

Service crash via missing BinAuth redirect parameter

Published Nov 17, 2023 · Updated Aug 2, 2024

NULL pointer dereference in openNDS Captive Portal before 10.1.2 allows remote attackers to crash the service via a crafted HTTP GET request. The BinAuth pre-authentication path invokes do_binauth without validating that the client redirect query parameter exists, causing a NULL dereference. The request needs no credentials, but BinAuth must be enabled; exploitation interrupts captive-portal service without reported data access or modification.

CVSS severity7.5
High
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in openNDS Captive Portal before 10.1.2 allows remote attackers to crash the service via a crafted HTTP GET request. The BinAuth pre-authentication path invokes do_binauth without validating that the client redirect query parameter exists, causing a NULL dereference. The request needs no credentials, but BinAuth must be enabled; exploitation interrupts captive-portal service without reported data access or modification.

The record

CVE
CVE-2023-38313
Published
Nov 17, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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