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CVE-2021-21003— Denial of Service Vulnerability in Phoenix Contact FL SWITCH SMCS series products

Quick assessment

Affected
Phoenix Contact FL SWITCH
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

CVSS 5.3 · Medium EPSS 0.95% · P60

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当的资源关闭或释放
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2021-21003

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Other References for CVE-2021-21003 (1)

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 product: FL SWITCH
Same vendor: Phoenix Contact
Same weakness: CWE-404

V. Comments for CVE-2021-21003

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