CVE-2021-21003— Denial of Service Vulnerability in Phoenix Contact FL SWITCH SMCS series products
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I. Basic Information for CVE-2021-21003
Vulnerability Information
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Vulnerability Title
Denial of Service Vulnerability in Phoenix Contact FL SWITCH SMCS series products
Source: NVD (National Vulnerability Database)
Vulnerability Description
In Phoenix Contact FL SWITCH SMCS series products in multiple versions fragmented TCP-Packets may cause a Denial of Service of Web-, SNMP- and ICMP-Echo services. The switching functionality of the device is not affected.
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
不恰当的资源关闭或释放
Source: NVD (National Vulnerability Database)
Vulnerability Title
Phoenix Contact FL SWITCH 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Phoenix Contact FL SWITCH是德国菲尼克斯电气（Phoenix Contact）公司的一款工业级以太网交换机。TCP（Transmission Control Protocol,传输控制协议）是一种面向连接的、可靠的、基于字节流的传输层通信协议，由IETF的RFC 793定义。 Phoenix Contact FL COMSERVER UNI 存在安全漏洞，该漏洞源于在Phoenix Contact FL SWITCH SMCS系列产品中，多个版本的tcp - packet碎片可能会
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 | SMCS 16TX (2700996) ~ 4.70 | - | |
| Phoenix Contact | FL NAT | SMN 8TX (2989365) ~ 4.63 | - |
II. Public POCs for CVE-2021-21003
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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- https://cert.vde.com/en-us/advisories/vde-2021-023x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2021-21003
Same Patch Batch · Phoenix Contact · 2021-06-25 · 7 CVEs total
| CVE-2021-33542 | 7.8 HIGH | Phoenix Contact: Automation Worx Software Suite affected by Remote Code Execution (RCE) vu |
| CVE-2021-21002 | 7.5 HIGH | Denial of Service in Phoenix Contact FL COMSERVER UNI products |
| CVE-2021-21005 | 7.5 HIGH | Race Condition Vulnerability in Phoenix Contact FL SWITCH SMCS series products |
| CVE-2021-33541 | 7.5 HIGH | Phoenix Contact: ILC1x Industrial controllers affected by Denial-of-Service vulnerability |
| CVE-2021-21004 | 7.4 HIGH | Cross-site Scripting Vulnerability in Phoenix Contact FL SWITCH SMCS series products |
| CVE-2021-33540 | 7.3 HIGH | Phoenix Contact: Undocumented FTP acces in certain AXL F BK and IL BK devices |
IV. Related Vulnerabilities
Same vendor: Phoenix Contact
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Phoenix Contact: Improper removal of sensitive information i - CVE-2026-22323
Cross‑Site Request Forgery in Link Aggregation Configuration - CVE-2026-22322
Stored Cross‑Site Scripting in Link Aggregation Name Handlin - CVE-2026-22321
Stack-Based Buffer Overflow in CLI Login Username Handling o - CVE-2026-22320
Stack-Based Buffer Overflow in TFTP File-Transfer Command Ha
Same weakness: CWE-404
- CVE-2026-8270
Open5GS SMF ogs_nas_parse_qos_rules denial of service - CVE-2026-8269
Open5GS SMF smf_nsmf_handle_create_sm_context denial of serv - CVE-2026-8268
Open5GS SMF OpenAPI_list_create denial of service - CVE-2026-8267
Open5GS SMF smf_nsmf_handle_created_data_in_vsmf denial of s - CVE-2026-8266
Open5GS SMF gsm-build.c gsm_build_pdu_session_establishment_
V. Comments for CVE-2021-21003
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