CVE-2021-21002
Denial of Service in Phoenix Contact FL COMSERVER UNI products
HIGH
7.5
CVSS Score
Published: June 25, 2021 at 06:25 PM UTC
Updated: June 17, 2026 at 03:34 AM UTC
4 products affected across 1 vendorFl Comserver Uni 232 /422 /485 FirmwareFl Comserver Uni 232 /422 /485-t FirmwareFl Comserver Uni 232/422/485
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Severity
HIGH7.5
Exploit prediction
EPSS 1.0%
Description
In Phoenix Contact FL COMSERVER UNI in versions < 2.40 a invalid Modbus exception response can lead to a temporary denial of service.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 2.40
Affected range stops below 2.40, so it looks safe — our inference, not a vendor statement
phoenixcontact-fl-comserver-uni-232-422-485 (same device)
v < 2.40
Affected range stops below 2.40, so it looks safe — our inference, not a vendor statement
phoenixcontact-fl-comserver-uni-232-422-485-t (same device)
All versions
All versions
Remediation
No guide yetNo remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.
References (1)
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://cert.vde.com/en-us/advisories/vde-2021-022CVSS
7.5HIGHCERTVDE
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-772
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