# CVE-2026-76721: HPE Networking Instant ON buffer overflow

Source: https://junglewise.ai/threats/cve-2026-76721-buffer-overflow-vulnerability-exists-in-the-affected-interface-of  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-29. Updated: 2026-09-29  
License: CC BY 4.0 with a link back

CVE-2026-76721 · Severity: critical · CVSS 9.8 · Published 2026-09-29

HPE Networking Instant ON is a cloud-managed wireless networking platform for small to medium businesses. A buffer overflow vulnerability in an affected network interface allows unauthenticated remote attackers to execute arbitrary code with elevated privileges on the underlying host, potentially compromising the entire network infrastructure and any data it manages.

Technologies: [Hpe Networking Instant On](https://junglewise.ai/threats/technologies/networking-instant-on). Vendors: [Hpe](https://junglewise.ai/threats/vendors/hpe).

## Quick answers

**Is CVE-2026-76721 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-76721 being exploited in the wild.

**How severe is CVE-2026-76721?** Critical severity, with a CVSS score of 9.8, published 29 September 2026.

**Which products and versions are affected?** HPE Networking Instant ON.

**Is there a fix for CVE-2026-76721?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-76721 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-76721?** Check whether you run Hpe Networking Instant On. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A buffer overflow exists in a network-accessible interface of HPE Networking Instant ON, exploitable without authentication over the network. Successful exploitation grants arbitrary code execution as a privileged user on the underlying operating system. The vulnerability requires only network access and no user interaction.

## Affected products

- HPE Networking Instant ON

## Timeline

- 2026-09-29: disclosed

## References

- [https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05150en_us&docLocale=en_US](https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05150en_us&docLocale=en_US)

## Related threats

- [HPE Networking Instant On information disclosure in OS](https://junglewise.ai/threats/cve-2026-76735-a-sensitive-information-disclosure-vulnerability-exists-in-the)
- [HPE Networking Instant On memory corruption](https://junglewise.ai/threats/cve-2026-76734-a-memory-corruption-vulnerability-in-the-affected-interface-of)
- [HPE Networking Instant On API denial-of-service](https://junglewise.ai/threats/cve-2026-76733-a-denial-of-service-vulnerability-exists-in-the-api-endpoint-of)
- [HPE Networking Instant ON local privilege escalation in daemon](https://junglewise.ai/threats/cve-2026-76732-a-local-privilege-escalation-vulnerability-has-been-discovered-in)
- [HPE Networking Instant On authentication bypass in captive portal](https://junglewise.ai/threats/cve-2026-76731-an-authentication-bypass-vulnerability-in-the-captive-portal-of)