# CVE-2026-121382: Netcore NBR100V2 integer overflow in AES decryption

Source: https://junglewise.ai/threats/cve-2026-121382-a-vulnerability-was-determined-in-netcore-nbr100v2-1-3-240614  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-03. Updated: 2026-11-03  
License: CC BY 4.0 with a link back

CVE-2026-121382 · Severity: high · CVSS 7.5 · Published 2026-11-03

Netcore NBR100V2 is a network device used to manage and route network traffic. An integer overflow vulnerability in the AES decryption function allows a remote attacker to cause the device to malfunction or execute arbitrary code without authentication. The exploit has been publicly disclosed and the vendor has not provided a patch.

Vendors: [Netcore](https://junglewise.ai/threats/vendors/netcore).

## Quick answers

**Is CVE-2026-121382 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-121382 being exploited in the wild.

**How severe is CVE-2026-121382?** High severity, with a CVSS score of 7.5, published 3 November 2026.

**Which products and versions are affected?** Netcore NBR100V2 1.3.240614.030928.

**Is there a fix for CVE-2026-121382?** 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-2026-121382 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-121382?** Check whether you run Netcore NBR100V2 at an affected version. 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

The vulnerability is an integer overflow in the msg_aes_dec function within /usr/bin/auto_ac in Netcore NBR100V2. This flaw allows remote exploitation without authentication via network access. Successful exploitation can lead to code execution or denial of service on the affected device.

## Affected products

- Netcore NBR100V2 1.3.240614.030928

## Timeline

- 2026-11-03: disclosed
- other: Vendor contacted but did not respond

## References

- [https://vuldb.com/cve/CVE-2026-121382](https://vuldb.com/cve/CVE-2026-121382)
- [https://vuldb.com/submit/1018496](https://vuldb.com/submit/1018496)

## Related threats

- [Netcore NBR100V2 missing authorization in ACL handler](https://junglewise.ai/threats/cve-2026-101000-a-vulnerability-was-determined-in-netcore-nbr100v2-1-3-240614)