PLANET GS-5220-8P2T2S up to 3.2412b261007 HTTP Cookie webstax_auth stack-based overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.6$0-$5k0.00+

Summaryinfo

A vulnerability, which was classified as very critical, has been found in PLANET GS-5220-8P2T2S up to 3.2412b261007. This issue affects some unknown processing of the component HTTP Cookie Handler. Performing a manipulation of the argument webstax_auth results in stack-based overflow. This vulnerability is reported as CVE-2026-109445. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical has been found in PLANET GS-5220-8P2T2S up to 3.2412b261007. This affects an unknown functionality of the component HTTP Cookie Handler. The manipulation of the argument webstax_auth with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. The product writes past the end of a buffer that was allocated on the stack. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at planet.com.tw. This vulnerability is uniquely identified as CVE-2026-109445 since 10/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/13/2026).

Upgrading to version 3.2412b261008 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.6

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: GS-5220-8P2T2S 3.2412b261008

Timelineinfo

10/12/2026 CVE reserved
11/13/2026 +32 days Advisory disclosed
11/13/2026 +0 days VulDB entry created
11/13/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: planet.com.tw
Status: Confirmed

CNA: VulnCheck
CVE: CVE-2026-109445 (🔒)

GCVE (CVE): GCVE-0-2026-109445
GCVE (VulDB): GCVE-100-437067

Entryinfo

Created: 11/13/2026 15:58
Changes: 11/13/2026 15:58 (76)
Complete: 🔍
Cache ID: 216::103

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