CVE-2026-109445: PLANET GS-5220-8P2T2S Stack Buffer Overflow via webstax_auth Cookie
PLANET Technology Corp. · PLANET GS-5220-8P2T2S
Fixed in 3.2412b261008 · Affected: PLANET Technology Corp. PLANET GS-5220-8P2T2S before 3.2412b261008 · Exploitation: not established
ExploitationNot established
Not in CISA KEV as of catalogue 2026.11.13 (13 Nov)
- In CISA KEV: not seen
- Exploited (reported): not seen
- Scanning observed: not seen
- Proof of concept public: not seen
- Not establishedNothing in the sources we check
Higher than 37% of scored CVEs
DescriptionNVD
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.
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- PLANET Technology Corp.
- Published
- November 2026
Coverage1 article · 1 outlet
First in our coverage: SecurityOnline, 14 Nov.
- PLANET fixes cookie flaws in its PoE switchSecurityOnline · first in our coverage
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