CVE-2021-21002: Denial of Service in Phoenix Contact FL COMSERVER UNI products
First published: Fri Jun 25 2021(Updated: )
In Phoenix Contact FL COMSERVER UNI in versions < 2.40 a invalid Modbus exception response can lead to a temporary denial of service.
Credit: info@cert.vde.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Phoenixcontact Fl Comserver Uni 232\/422\/485 Firmware | <2.40 | |
| Phoenixcontact Fl Comserver Uni 232\/422\/485 | ||
| Phoenixcontact Fl Comserver Uni 232\/422\/485-t Firmware | <2.40 | |
| Phoenixcontact Fl Comserver Uni 232\/422\/485-t |
Remedy
Upgrade to the latest firmware, fixed firmware includes versions >= 2.41.
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Reference Links
Frequently Asked Questions
What is the vulnerability ID for this Phoenix Contact FL COMSERVER UNI vulnerability?
The vulnerability ID is CVE-2021-21002.
What is the severity of CVE-2021-21002?
The severity of CVE-2021-21002 is high with a score of 7.5.
How can an invalid Modbus exception response in versions < 2.40 of Phoenix Contact FL COMSERVER UNI lead to a denial of service?
An invalid Modbus exception response can cause a temporary denial of service by disrupting the normal operation of the COMSERVER UNI.
Which versions of Phoenix Contact FL COMSERVER UNI are affected by CVE-2021-21002?
Versions up to but excluding 2.40 of Phoenix Contact FL COMSERVER UNI are affected by CVE-2021-21002.
How can I mitigate the vulnerability in Phoenix Contact FL COMSERVER UNI?
To mitigate the vulnerability, update Phoenix Contact FL COMSERVER UNI to a version higher than or equal to 2.40.
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- agent/references
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- agent/last-modified-date
- agent/event
- agent/tags
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- vendor/phoenixcontact
- canonical/phoenixcontact fl comserver uni 232\/422\/485 firmware
- canonical/phoenixcontact fl comserver uni 232\/422\/485
- canonical/phoenixcontact fl comserver uni 232\/422\/485-t firmware
- canonical/phoenixcontact fl comserver uni 232\/422\/485-t