# CVE-2020-37206: Nsasoft ShareAlarmPro buffer overflow in registration key field

Source: https://junglewise.ai/threats/cve-2020-37206-nsasoft-sharealarmpro-buffer-overflow-in-registration-key-field  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-11. Updated: 2026-06-29  
License: CC BY 4.0 with a link back

CVE-2020-37206 · Severity: high · CVSS 7.5 · Published 2026-02-11

ShareAlarmPro, a network access control and security auditing tool, is vulnerable to a flaw that can cause the application to crash. An attacker can trigger this by entering an excessively long registration key into the software's activation field. This results in a denial-of-service, preventing legitimate users from using the security software to monitor their network.

Vendors: [Nsasoft](https://junglewise.ai/threats/vendors/nsasoft).

## Quick answers

**Is CVE-2020-37206 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2020-37206 being exploited in the wild.

**How severe is CVE-2020-37206?** High severity, with a CVSS score of 7.5, published 11 February 2026.

**Which products and versions are affected?** Nsasoft Sharealarmpro All versions (up to and including 2020 releases).

**Is there a fix for CVE-2020-37206?** 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-2020-37206 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2020-37206?** Check whether you run Nsasoft Sharealarmpro 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

A classic buffer overflow (CWE-120) exists in ShareAlarmPro Advanced Network Access Control within the registration key input field. The application fails to perform adequate bounds checking on the input length before copying it into a fixed-size buffer. An attacker can exploit this by providing a registration key approximately 1,000 characters long, leading to memory corruption and an immediate application crash (Denial of Service). While the attack requires local interaction to paste the key, it does not require prior authentication. A public Proof of Concept (PoC) exists, but no official patch has been confirmed in the advisory.

## Affected products

- Nsasoft (NSAuditor) ShareAlarmPro Advanced Network Access Control All versions (up to and including 2020 releases)

## Timeline

- 2020-01-06: disclosed: Initial exploit PoC published to Exploit-DB
- 2026-02-11: advisory: NVD/VulnCheck advisory published

## References

- [http://www.nsauditor.com/](http://www.nsauditor.com/)
- [https://www.exploit-db.com/exploits/47859](https://www.exploit-db.com/exploits/47859)
- [https://www.vulncheck.com/advisories/sharealarmpro-advanced-network-access-control-key-denial-of-service](https://www.vulncheck.com/advisories/sharealarmpro-advanced-network-access-control-key-denial-of-service)