CVE-2021-21005— Race Condition Vulnerability in Phoenix Contact FL SWITCH SMCS series products
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I. Basic Information for CVE-2021-21005
Vulnerability Information
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Vulnerability Title
Race Condition 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 if an attacker sends a hand-crafted TCP-Packet with the Urgent-Flag set and the Urgent-Pointer set to 0, the network stack will crash. The device needs to be rebooted afterwards.
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:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Phoenix Contact FL SWITCH竞争条件问题漏洞
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。 Phoenix Contact FL SWITCH SMCS 存在安全漏洞，攻击者可利用该漏洞发送一个设置了紧急标志和紧急指针为0的手工tcp包，会使网络堆栈崩溃，之后需要重新启动设备。
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-2021-21005
| # | 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-2021-21005
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-2021-33541 | 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 |
| CVE-2021-21003 | 5.3 MEDIUM | Denial of Service Vulnerability in Phoenix Contact FL SWITCH SMCS series products |
IV. Related Vulnerabilities
Same vendor: Phoenix Contact
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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
V. Comments for CVE-2021-21005
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