# CVE-2026-81944: PLANET IGS-5225-8P2T4S stack-based buffer overflow in web server

Source: https://junglewise.ai/threats/cve-2026-81944-planet-igs-5225-8p2t4s-industrial-managed-switch-v1-and-v2  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-81944 · Severity: high · CVSS 7.5 · Published 2026-09-18

The PLANET IGS-5225-8P2T4S is an industrial managed network switch used to provide secure connectivity in critical infrastructure environments. A stack-based buffer overflow in the device's web server allows an authenticated attacker to crash the device or execute arbitrary code with root privileges, potentially compromising the entire network segment the switch protects.

Technologies: [PLANET IGS-5225-8P2T4S V1](https://junglewise.ai/threats/technologies/igs-5225-8p2t4s-v1), [PLANET IGS-5225-8P2T4S V2](https://junglewise.ai/threats/technologies/igs-5225-8p2t4s-v2). Vendors: [PLANET](https://junglewise.ai/threats/vendors/planet).

## Quick answers

**Is CVE-2026-81944 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-81944 being exploited in the wild.

**How severe is CVE-2026-81944?** High severity, with a CVSS score of 7.5, published 18 September 2026.

**Which products and versions are affected?** PLANET IGS-5225-8P2T4S V1 before 1.2412b260707; PLANET IGS-5225-8P2T4S V2 before 2.2412b260519.

**Is there a fix for CVE-2026-81944?** A patch was published on 2026-09-18: Firmware v1.2412b260707 for V1 and v2.2412b260519 for V2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-81944 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-81944?** Check whether you run PLANET IGS-5225-8P2T4S V1 or PLANET IGS-5225-8P2T4S V2 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 stack-based buffer overflow (CWE-121) exists in the web server component of affected firmware versions due to insufficient bounds checking when copying user-supplied data into a stack buffer. Remote authentication is required; the vulnerability is exploitable over the network with high complexity. Successful exploitation grants arbitrary code execution with operating system-level privileges, or can trigger denial of service.

## Affected products

- PLANET IGS-5225-8P2T4S V1 before 1.2412b260707
- PLANET IGS-5225-8P2T4S V2 before 2.2412b260519

## Timeline

- 2026-09-18: disclosed
- 2026-09-18: patched: Firmware v1.2412b260707 for V1 and v2.2412b260519 for V2

## References

- [https://www.planet.com.tw/en/support/security-advisory/11](https://www.planet.com.tw/en/support/security-advisory/11)
- [https://www.vulncheck.com/advisories/planet-igs-5225-8p2t4s-v1-v2-stack-based-buffer-overflow-via-web-server](https://www.vulncheck.com/advisories/planet-igs-5225-8p2t4s-v1-v2-stack-based-buffer-overflow-via-web-server)

## Related threats

- [PLANET IGS-5225-8P2T4S weak password hashing in firmware](https://junglewise.ai/threats/cve-2026-81946-planet-igs-5225-8p2t4s-industrial-managed-switch-v1-and-v2)
- [PLANET IGS-5225-8P2T4S stack-based buffer overflow in web server](https://junglewise.ai/threats/cve-2026-81945-planet-igs-5225-8p2t4s-industrial-managed-switch-v1-and-v2)
- [PLANET IGS-5225-8P2T4S debug mode remote code execution](https://junglewise.ai/threats/cve-2026-81943-planet-igs-5225-8p2t4s-industrial-managed-switch-v1-and-v2)
- [PLANET IGS-5225-8P2T4S OS command injection in web server](https://junglewise.ai/threats/cve-2026-81942-planet-igs-5225-8p2t4s-industrial-managed-switch-v1-and-v2)