CVE-2026-38821

OpenNDS Buffer Overflow Enables Denial of Service and Remote Code Execution

Published Aug 28, 2026 CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Description
A heap-based buffer overflow vulnerability exists in openNDS before 11.0.0 that allows an unauthenticated attacker on the captive portal network to crash the openNDS daemon (denial of service) and potentially achieve remote code execution. This is in http_microhttpd.c.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title OpenNDS Buffer Overflow Enables Denial of Service and Remote Code Execution
Type Values Removed Values Added
Description A heap-based buffer overflow vulnerability exists in openNDS before 11.0.0 that allows an unauthenticated attacker on the captive portal network to crash the openNDS daemon (denial of service) and potentially achieve remote code execution. This is in http_microhttpd.c.
First Time appeared Opennds
Opennds opennds
Weaknesses CWE-122
CPEs cpe:2.3:a:opennds:opennds:*:*:*:*:*:*:*:*
Vendors & Products Opennds
Opennds opennds
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Aug 28, 2026, 3:24 PM
Reserved
Apr 6, 2026, 10:01 AM
Status
Deferred
Published
Aug 28, 2026, 2:16 AM
Modified
Sep 9, 2026, 3:54 PM