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High severity7.5NVD Advisory· Published Jun 25, 2021· Updated Jun 17, 2026

CVE-2021-21002

CVE-2021-21002

Description

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

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

4

Phoenixcontact/Fl Comserver Uni 232\/422\/485 T Firmware
cpe:2.3:o:phoenixcontact:fl_comserver_uni_232\/422\/485-t_firmware:*:*:*:*:*:*:*:*
Range: <2.40
Phoenixcontact/Fl Comserver Uni 232\/422\/485 Firmware
cpe:2.3:o:phoenixcontact:fl_comserver_uni_232\/422\/485_firmware:*:*:*:*:*:*:*:*
Range: <2.40
Phoenixcontact/FL COMSERVER UNIllm-fuzzy2 versions
<2.40+ 1 more
- (no CPE)range: <2.40
- (no CPE)range: UNI 232/422/485 (2313452)

Patches

Vulnerability mechanics

References

1

cert.vde.com/en-us/advisories/vde-2021-022nvdThird Party Advisory

News mentions

0

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