CVE-2023-38321Network attack vector

Captive portal outage via missing authentication parameters

Published Dec 25, 2023 · Updated Aug 2, 2024

NULL pointer dereference in Sierra Wireless ALEOS before 4.17.0.12 allows remote attackers to crash the OpenNDS captive portal. The /opennds_auth/ request handler dereferences missing custom query-string and client-token values instead of rejecting the incomplete request. No authentication or user interaction is required; a malformed GET request stops the daemon and interrupts captive-portal service.

CVSS severity7.5
High
EPSS probability1.10%
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 Sierra Wireless ALEOS before 4.17.0.12 allows remote attackers to crash the OpenNDS captive portal. The /opennds_auth/ request handler dereferences missing custom query-string and client-token values instead of rejecting the incomplete request. No authentication or user interaction is required; a malformed GET request stops the daemon and interrupts captive-portal service.

The record

CVE
CVE-2023-38321
Published
Dec 25, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 25, 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

7.5UbuntuCVSS: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
T1499Endpoint Denial of Service

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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