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CVE-2026-22316— Buffer Overflow using TFTP Filename

Quick assessment

Affected
Phoenix Contact FL SWITCH 2005
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PHOENIX CONTACT FL SWITCH和PHOENIX CONTACT FL NAT都是德国菲尼克斯电气（PHOENIX CONTACT）公司的产品。PHOENIX CONTACT FL SWITCH是一款工业级以太网交换机。PHOENIX CONTACT FL NAT是一系列工业安全网关。 Phoenix Contact多款产品存在安全漏洞，该漏洞源于设置TFTP文件名时存在基于栈的缓冲区溢出，可能导致拒绝服务攻击。以下产品受到影响：FL NAT 2008、FL NAT 2208、FL NA

CVSS 6.5 · Medium EPSS 0.38% · P29

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-22316

Vulnerability Information
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Vulnerability Title
Buffer Overflow using TFTP Filename
Source: CVE Program / CVE List V5
Vulnerability Description
A remote attacker with user privileges for the webUI can use the setting of the TFTP Filename with a POST Request to trigger a stack-based Buffer Overflow, resulting in a DoS attack.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Phoenix Contact多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PHOENIX CONTACT FL SWITCH和PHOENIX CONTACT FL NAT都是德国菲尼克斯电气（PHOENIX CONTACT）公司的产品。PHOENIX CONTACT FL SWITCH是一款工业级以太网交换机。PHOENIX CONTACT FL NAT是一系列工业安全网关。 Phoenix Contact多款产品存在安全漏洞，该漏洞源于设置TFTP文件名时存在基于栈的缓冲区溢出，可能导致拒绝服务攻击。以下产品受到影响：FL NAT 2008、FL NAT 2208、FL NA
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Phoenix Contact FL SWITCH 2005 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2008 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2016 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2105 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2108 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2116 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2204-2TC-2SFX 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2205 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2206-2FX 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2206-2FX SM 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2206-2FX SM ST 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2206-2FX ST 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2206-2SFX 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2206-2SFX PN 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2206C-2FX 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2207-FX 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2207-FX SM 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2208 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2208 PN 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2208C 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2212-2TC-2SFX 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2214-2FX 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2214-2FX SM 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2214-2SFX 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2214-2SFX PN 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2216 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2216 PN 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2304-2GC-2SFP 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2306-2SFP 0.0.0 ~ 3.53 -
Phoenix Contact FL SWITCH 2306-2SFP PN 0.0.0 ~ 3.53 -

II. Public POCs for CVE-2026-22316

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III. Intelligence Information for CVE-2026-22316

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Vendor Advisories for CVE-2026-22316 (1)

Same Patch Batch · Phoenix Contact · 2026-03-18 · 8 CVEs total

CVE-2026-22317 7.2 HIGH Command Injection Vulnerability in Root CA Certificate Transfer Workflow
CVE-2026-22323 7.1 HIGH Cross‑Site Request Forgery in Link Aggregation Configuration
CVE-2026-22322 7.1 HIGH Stored Cross‑Site Scripting in Link Aggregation Name Handling
CVE-2026-22320 6.5 MEDIUM Stack-Based Buffer Overflow in TFTP File-Transfer Command Handling over CLI
CVE-2026-22321 5.3 MEDIUM Stack-Based Buffer Overflow in CLI Login Username Handling over CLI
CVE-2026-22318 4.9 MEDIUM Stack-Based Buffer Overflow in File Transfer Parameter Handling
CVE-2026-22319 4.9 MEDIUM Stack-Based Buffer Overflow in File Install Parameter Handling

IV. Related Vulnerabilities

Same product: FL SWITCH 2005
Same vendor: Phoenix Contact
Same weakness: CWE-121

V. Comments for CVE-2026-22316

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