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CVE-2026-22321— Stack-Based Buffer Overflow in CLI Login Username Handling over CLI

CVSS 5.3 · Medium EPSS 0.02% · P5
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I. Basic Information for CVE-2026-22321

Vulnerability Information
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Vulnerability Title
Stack-Based Buffer Overflow in CLI Login Username Handling over CLI
Source: NVD (National Vulnerability Database)
Vulnerability Description
A stack-based buffer overflow in the device's Telnet/SSH CLI login routine occurs when a unauthenticated attacker send an oversized or unexpected username input. An overflow condition crashes the thread handling the login attempt, forcing the session to close. Because other CLI sessions remain unaffected, the impact is limited to a low‑severity availability disruption.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
栈缓冲区溢出
Source: NVD (National Vulnerability Database)
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，该漏洞源于设备Telnet/SSH CLI登录例程中存在基于栈的缓冲区溢出，可能导致未经身份验证的攻击者造成线程崩溃，引发可用性中断。以下产品受到影响：
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

VendorProductAffected VersionsCPESubscribe
Phoenix ContactFL SWITCH 2005 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2008 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2016 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2105 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2108 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2116 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2204-2TC-2SFX 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2205 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2206-2FX 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2206-2FX SM 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2206-2FX SM ST 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2206-2FX ST 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2206-2SFX 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2206-2SFX PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2206C-2FX 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2207-FX 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2207-FX SM 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2208 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2208 PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2208C 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2212-2TC-2SFX 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2214-2FX 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2214-2FX SM 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2214-2SFX 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2214-2SFX PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2216 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2216 PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2304-2GC-2SFP 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2306-2SFP 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2306-2SFP PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2308 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2308 PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2312-2GC-2SFP 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2314-2SFP 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2314-2SFP PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2316 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2316 PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2404-2TC-2SFX 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2406-2SFX 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2406-2SFX PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2408 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2408 PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2412-2TC-2SFX 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2414-2SFX 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2414-2SFX PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2416 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2416 PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2504-2GC-2SFP 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2506-2SFP 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2506-2SFP PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2508 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2508 PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2512-2GC-2SFP 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2514-2SFP 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2514-2SFP PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2516 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2516 PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2608 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2608 PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2708 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2708 PN 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2303-8SP1 0.0.0 ~ 3.53 -
Phoenix ContactFL NAT 2008 0.0.0 ~ 3.53 -
Phoenix ContactFL NAT 2208 0.0.0 ~ 3.53 -
Phoenix ContactFL NAT 2304-2GC-2SFP 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2008F 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2316/K1 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2506-2SFP/K1 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 2508/K1 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH TSN 2316 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH TSN 2312-2GC-2SFP 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH TSN 2314-2SFP 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 5924-4GC 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 5916-8GC-4SFP+ 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 5924SFP-4GC 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 5924-4SFP+ 0.0.0 ~ 3.53 -
Phoenix ContactFL SWITCH 5916SFP-8GC-4SFP+ 0.0.0 ~ 3.53 -

II. Public POCs for CVE-2026-22321

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III. Intelligence Information for CVE-2026-22321

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

CVE-2026-223177.2 HIGHCommand Injection Vulnerability in Root CA Certificate Transfer Workflow
CVE-2026-223237.1 HIGHCross‑Site Request Forgery in Link Aggregation Configuration
CVE-2026-223227.1 HIGHStored Cross‑Site Scripting in Link Aggregation Name Handling
CVE-2026-223166.5 MEDIUMBuffer Overflow using TFTP Filename
CVE-2026-223206.5 MEDIUMStack-Based Buffer Overflow in TFTP File-Transfer Command Handling over CLI
CVE-2026-223184.9 MEDIUMStack-Based Buffer Overflow in File Transfer Parameter Handling
CVE-2026-223194.9 MEDIUMStack-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-2026-22321

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