# CVE-2026-75124: PLANET GS-4210-16P2S V3 pre-authentication memory corruption

Source: https://junglewise.ai/threats/cve-2026-75124-planet-gs-4210-16p2s-v3-pre-authentication-memory-corruption  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-28. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-75124 · Severity: high · CVSS 7.5 · Published 2026-08-28

The PLANET GS-4210-16P2S V3 is a managed network switch used in corporate environments to control traffic between servers and endpoints. A pre-authentication vulnerability in its web management interface allows an unauthenticated attacker to send a specially crafted web request that crashes the management service, rendering the switch unmanageable. An attacker could exploit this to disrupt network operations or potentially gain deeper system access.

Technologies: [PLANET GS-4210-16P2S V3](https://junglewise.ai/threats/technologies/gs-4210-16p2s-v3). Vendors: [PLANET](https://junglewise.ai/threats/vendors/planet).

## Quick answers

**Is CVE-2026-75124 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-75124 being exploited in the wild.

**How severe is CVE-2026-75124?** High severity, with a CVSS score of 7.5, published 28 August 2026.

**Which products and versions are affected?** PLANET GS-4210-16P2S V3 before 3.441b260626.

**Is there a fix for CVE-2026-75124?** 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-2026-75124 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-75124?** Check whether you run PLANET GS-4210-16P2S V3 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

This vulnerability is a classic buffer overflow (CWE-120) in the HTTP query-string parsing logic of the dispatcher.cgi web interface. The vulnerable _readHttpParam function reads an oversized GET request parameter without ensuring proper NUL termination, then passes the data to parse_query_string where it is processed into a fixed-size stack buffer. An unauthenticated remote attacker can send an oversized GET request to /cgi-bin/dispatcher.cgi to trigger denial of service or memory corruption. No authentication is required; the network vector is direct HTTP. A patch is available in firmware version 3.441b260626 and later.

## Affected products

- PLANET GS-4210-16P2S V3 before 3.441b260626

## Timeline

- 2026-08-28: disclosed

## References

- [https://www.planet.com.tw/en/support/security-advisory/10](https://www.planet.com.tw/en/support/security-advisory/10)
- [https://www.vulncheck.com/advisories/planet-gs-4210-16p2s-memory-corruption-via-dispatcher-cgi-readhttpparam](https://www.vulncheck.com/advisories/planet-gs-4210-16p2s-memory-corruption-via-dispatcher-cgi-readhttpparam)

## Related threats

- [PLANET GS-4210-16P2S V3 stack buffer overflow in dispatcher.cgi](https://junglewise.ai/threats/cve-2026-77218-planet-gs-4210-16p2s-v3-stack-buffer-overflow-in-dispatcher-cgi)
- [PLANET GS-4210-16P2S V3 stack buffer overflow in RADIUS handlers](https://junglewise.ai/threats/cve-2026-77217-planet-gs-4210-16p2s-v3-stack-buffer-overflow-in-radius-handlers)
- [PLANET GS-4210-16P2S V3 stack buffer overflow in dispatcher.cgi handlers](https://junglewise.ai/threats/cve-2026-75126-planet-gs-4210-16p2s-v3-stack-buffer-overflow-in-dispatcher-cgi)
- [PLANET GS-4210-16P2S V3 null pointer dereference in dispatcher.cgi](https://junglewise.ai/threats/cve-2026-75125-planet-gs-4210-16p2s-v3-null-pointer-dereference-in-dispatcher)
- [PLANET GS-4210-16P2S V3 OS command injection in dispatcher.cgi](https://junglewise.ai/threats/cve-2026-75123-planet-gs-4210-16p2s-v3-os-command-injection-in-dispatcher-cgi)