1. Home
  2. CVE Database
  3. CVE-2021-21002
HIGH · 7.5

CVE-2021-21002

In Phoenix Contact FL COMSERVER UNI in versions < 2.40 a invalid Modbus exception response can lead to a temporary denial of service.

Vulnerability Description

In Phoenix Contact FL COMSERVER UNI in versions < 2.40 a invalid Modbus exception response can lead to a temporary denial of service.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
PhoenixcontactFl Comserver Uni 232\/422\/485 Firmware< 2.40
PhoenixcontactFl Comserver Uni 232\/422\/485-
PhoenixcontactFl Comserver Uni 232\/422\/485-T Firmware< 2.40
PhoenixcontactFl Comserver Uni 232\/422\/485-T-

Related Weaknesses (CWE)

CWE-772

References

FAQ

What is CVE-2021-21002?

CVE-2021-21002 is a vulnerability with a CVSS score of 7.5 (HIGH). In Phoenix Contact FL COMSERVER UNI in versions < 2.40 a invalid Modbus exception response can lead to a temporary denial of service.

How severe is CVE-2021-21002?

CVE-2021-21002 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-21002?

Check the references section above for vendor advisories and patch information. Affected products include: Phoenixcontact Fl Comserver Uni 232\/422\/485 Firmware, Phoenixcontact Fl Comserver Uni 232\/422\/485, Phoenixcontact Fl Comserver Uni 232\/422\/485-T Firmware, Phoenixcontact Fl Comserver Uni 232\/422\/485-T.