CVE-2021-21004
MEDIUMCVSS 6.1/10EPSS 0.58%
Last modified
CVE-2021-21004 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. In Phoenix Contact FL SWITCH SMCS series products in multiple versions an attacker may insert malicious code via LLDP frames into the web-based management which could then be executed by the client.. EPSS estimates a 0.58% chance of exploitation in the next 30 days.
Description
In Phoenix Contact FL SWITCH SMCS series products in multiple versions an attacker may insert malicious code via LLDP frames into the web-based management which could then be executed by the client.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Phoenixcontact | Fl Switch Smcs 16tx Firmware | <= 4.70 |
| Phoenixcontact | Fl Switch Smcs 14tx\/2fx Firmware | <= 4.70 |
| Phoenixcontact | Fl Switch Smcs 14tx\/2fx-Sm Firmware | <= 4.70 |
| Phoenixcontact | Fl Switch Smcs 8gt Firmware | <= 4.70 |
| Phoenixcontact | Fl Switch Smcs 6gt\/2sfp Firmware | <= 4.70 |
| Phoenixcontact | Fl Switch Smcs 8tx-Pn Firmware | <= 4.70 |
| Phoenixcontact | Fl Switch Smcs 4tx-Pn Firmware | <= 4.70 |
| Phoenixcontact | Fl Switch Smcs 8tx Firmware | <= 4.70 |
| Phoenixcontact | Fl Switch Smcs 6tx\/2sfp Firmware | <= 4.70 |
| Phoenixcontact | Fl Switch Smn 6tx\/2pof-Pn Firmware | <= 4.70 |
| Phoenixcontact | Fl Switch Smn 8tx-Pn Firmware | <= 4.70 |
| Phoenixcontact | Fl Switch Smn 6tx\/2fx Firmware | <= 4.70 |
| Phoenixcontact | Fl Switch Smn 6tx\/2fx Sm Firmware | <= 4.70 |
| Phoenixcontact | Fl Nat Smn 8tx Firmware | <= 4.63 |
| Phoenixcontact | Fl Nat Smn 8tx-M Firmware | <= 4.63 |
References
- https://cert.vde.com/en-us/advisories/vde-2021-023Not Applicable, Third Party Advisory
- https://cert.vde.com/en-us/advisories/vde-2021-023Not Applicable, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-21004?
In Phoenix Contact FL SWITCH SMCS series products in multiple versions an attacker may insert malicious code via LLDP frames into the web-based management which could then be executed by the client.
How severe is CVE-2021-21004?
CVE-2021-21004 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.
How do I fix CVE-2021-21004?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-21004?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST