CVE-2021-21003
MEDIUMCVSS 5.3/10EPSS 0.95%
Last modified
CVE-2021-21003 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 0.95% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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-2021-023Third Party Advisory
- https://cert.vde.com/en-us/advisories/vde-2021-023Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-21003?
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.
How severe is CVE-2021-21003?
CVE-2021-21003 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.95% probability of exploitation in the next 30 days.
How do I fix CVE-2021-21003?
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-2021-21003?
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Scan your code nowSource: NVD / NIST