What is CVE-2019-9590?

CVE-2019-9590 is a high-severity vulnerability in Tengcon T-920 Plc. CVSS score: 7.5/10. Published 2019-03-06.

How severe is CVE-2019-9590?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Tengcon T-920 Plc

CVE-2019-9590

An issue was discovered on TENGCONTROL T-920 PLC v5.5 devices. It allows remote attackers to cause a denial of service (persistent failure mode) by sending a series of \x19\xb2\x00\x00\x00\x06\x43\x01\x00\xac\xff\x00 (aka UID 0x43) requests to TCP port 502.

Published 2019-03-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.018 (78.5th percentile), scored 2026-10-25.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Tengcon T-920 Plc
Tengcon T-920 Plc Firmware — versions 5.5

References

github.com/Ni9htMar3/vulnerability/blob/master/PLC/腾控/T920_PLC_DOS.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-9590?: CVE-2019-9590 is a high-severity vulnerability in Tengcon T-920 Plc. CVSS score: 7.5/10. Published 2019-03-06.
How severe is CVE-2019-9590?: High severity. CVSS v3 base score is 7.5 out of 10.