What is CVE-2020-5543?

CVE-2020-5543 is a critical-severity vulnerability in Mitsubishielectric Iu1-1m20-D, classified under Session Fixation. CVSS score: 9.8/10. Published 2020-03-16.

How severe is CVE-2020-5543?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Mitsubishielectric Iu1-1m20-D

CVE-2020-5543

TCP function included in the firmware of Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier does not properly manage sessions, which allows remote attackers to stop the network functions or execute malware via a specially crafted packet.

EPSS: 0.021 (80.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mitsubishielectric Iu1-1m20-d
Mitsubishielectric Iu1-1m20-d_firmware
Mitsubishi Electric Corporation Melqic Iu1 Series — versions IU1-1M20-D firmware version 1.0.7 and earlier

Weakness classification (CWE)

CWE-384 — Session Fixation

References

vultures@jpcert.or.jp (Third Party Advisory, x_refsource_MISC)
vultures@jpcert.or.jp (Patch, x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2020-5543?: CVE-2020-5543 is a critical-severity vulnerability in Mitsubishielectric Iu1-1m20-D, classified under Session Fixation. CVSS score: 9.8/10. Published 2020-03-16.
How severe is CVE-2020-5543?: Critical severity. CVSS v3 base score is 9.8 out of 10.