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