November 13, 2026

CVE Watchtower

CVE-2026-109445PLANET Technology Corp. PLANET GS-5220-8P2T2S Stack-based Buffer Overflow

NVD

Vulnerability Summary

PLANET GS-5220-8P2T2S (hardware version 3.0) firmware versions before 3.2412b261008 contains a stack-based buffer overflow vulnerability that allows unauthenticated attackers to corrupt stack memory by submitting an oversized webstax_auth HTTP Cookie value that is copied into a fixed-size stack buffer without length validation. Attackers can send a crafted unauthenticated HTTP request with an oversized cookie to overwrite the saved return address and corrupt stack memory, leading to memory corruption and potential denial of service on the device.
Severity Level
CRITICAL(9.3)
Published Date
Nov 13, 2026
Last Modified
Nov 13, 2026
Exploitation Status
No confirmed exploitation yet
Root Weakness (CWE)
CWE-121: Stack-based Buffer Overflow β†—
The buffer being overwritten is allocated on the stack.
CVSS v4.0 Base Metrics — Score 9.3 (CRITICAL)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredNone
User InteractionNone
Confidentiality (Vulnerable System)High
Integrity (Vulnerable System)High
Availability (Vulnerable System)High
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)None
Show CVSS v3.x metrics (score 9.8)
CVSS v3.1 Base Metrics — Score 9.8 (CRITICAL)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • PLANET Technology Corp. PLANET GS-5220-8P2T2S < 3.2412b261008
Patched Versions
  • PLANET Technology Corp. PLANET GS-5220-8P2T2S 3.2412b261008

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is critical.

  1. Check whether you run PLANET Technology Corp. PLANET GS-5220-8P2T2S and which version.
  2. Update to a patched version listed above, then confirm the new version.

Timeline

  • Nov 13, 2026Published
  • Nov 13, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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External References

Data last checked: Nov 13, 2026 15:29 (site time)