TI-2026-28215 Aliases CVE-2026-38821 GHSA-rm65-3jj4-3vcm

Heap-based buffer overflow in openNDS

LOW 33CWE-122Published 2026-08-28 · Updated 2026-08-28

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Code execution
Confidentiality · integrity · availability: High · High · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00307 23rd percentileScored 2026-11-07

Fix Fixed openNDS (openNDS): 11.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
openNDS	openNDS	before 11.0.0	11.0.0	Patch available	CNA

openNDS VendoropenNDS Affected before 11.0.0 Fixed in 11.0.0 Patch available CNA

Remediation

Fix · CNA openNDS (openNDS) Fixed in 11.0.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-08-28
openNDS 11.0.0
4 records Highest priority Priority MEDIUM 2 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2026-28214 OS command injection in openNDSPriority MEDIUM 43
- TI-2026-28216 OS command injection in openNDSPriority MEDIUM 40
- TI-2026-28213 Memory leak in openNDSPriority LOW 24
Show all 4 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-38821
2026-10-03 Alias added: GHSA-rm65-3jj4-3vcm

References

Other 1

https://github.com/openNDS/openNDS/commit/3b5f7ef40cd048826d3c4a16f61a73a1768fd5a9

TI-2023-19721 An issue was discovered in OpenNDS before 10.1.3. CVSS 3.1CRITICAL 9.8
TI-2023-21723 An issue was discovered in the captive portal in OpenNDS before version 10.1.3. CVSS 3.1CRITICAL 9.8
TI-2023-19715 An issue was discovered in OpenNDS before 10.1.3. CVSS 3.1CRITICAL 9.8
TI-2023-19714 An issue was discovered in OpenNDS Captive Portal before version 10.1.2. CVSS 3.1CRITICAL 9.8
TI-2023-19717 An issue was discovered in OpenNDS before 10.1.3. CVSS 3.1CRITICAL 9.8
TI-2023-19716 An issue was discovered in OpenNDS before 10.1.3. CVSS 3.1CRITICAL 9.8

See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences