Vulnerability · Published Jun 25, 2021 · Assigned by CERTVDE
CVE-2021-21005Race Condition Vulnerability in Phoenix Contact FL SWITCH SMCS series products
High 7.5
In plain English
A high-severity race condition in FL NAT from Phoenix Contact. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 47.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Phoenix Contact | FL SWITCH | SMCS 16TX (2700996) – through 4.70SMCS 14TX/2FX (2700997) – through 4.70SMCS 14TX/2FX-SM (2701466) – through 4.70SMCS 8GT (2891123) – through 4.70SMCS 6GT/2SFP (2891479) – through 4.70SMCS 8TX-PN (2989103) – through 4.70SMCS 4TX-PN (2989093) – through 4.70SMCS 8TX (2989226) – through 4.70 |
| Phoenix Contact | FL NAT | SMN 8TX (2989365) – through 4.63SMN 8TX-M (2702443) – through 4.63 |
Weakness: CWE-362 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://cert.vde.com/en-us/advisories/vde-2021-023 x_refsource_CONFIRM