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Fencer Vulns
high 7.5

CVE-2020-5668 json

Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series modules (R00/01/02CPU firmware version '19' and earlier, R04/08/16/32…

published 2020-11-20 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-26829

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.9%
EPSS 4.9% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series modules (R00/01/02CPU firmware version '19' and earlier, R04/08/16/32/120 (EN) CPU firmware version '51' and earlier, R08/16/32/120SFCPU firmware version '22' and earlier, R08/16/32/120PCPU firmware version '25' and earlier, R08/16/32/120PSFCPU firmware version '06' and earlier, RJ71EN71 firmware version '47' and earlier, RJ71GF11-T2 firmware version '47' and earlier, RJ72GF15-T2 firmware version '07' and earlier, RJ71GP21-SX firmware version '47' and earlier, RJ71GP21S-SX firmware version '47' and earlier, and RJ71GN11-T2 firmware version '11' and earlier) allows a remote unauthenticated attacker to cause an error in a CPU unit and cause a denial-of-service (DoS) condition in execution of the program and its communication, or to cause a denial-of-service (DoS) condition in communication via the unit by receiving a specially crafted SLMP packet

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-20-324-05 updated cvss 7.5

Mitsubishi Electric MELSEC iQ-R Series (Update C)

  • Mitsubishi Electric R00/01/02CPU <= 19 Mitsubishi Electric R04/08/16/32/120(EN)CPU <= 51 Mitsubishi Electric R08/16/32/120PCPU <= 25 Mitsubishi Electric R08/16/32/120PSFCPU <= 06 Mitsubishi Electric R08/16/32/120SFCPU <= 22 Mitsubishi Electric RJ71C24(-R2/R4)
    +6 more products
    Mitsubishi Electric RJ71EN71 <= 47 Mitsubishi Electric RJ71GF11-T2 <= 47 Mitsubishi Electric RJ71GN11-T2 <= 11 Mitsubishi Electric RJ71GP21-SX <= 47 Mitsubishi Electric RJ71GP21S-SX <= 47 Mitsubishi Electric RJ72GF15-T2 <= 07
    affected: vendor fix, mitigation “Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R00/01/02CPU: firmware Versions 20 or later” mitsubishielectric.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

4.93% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

  • Mitsubishi Electric Corporation MELSEC iQ-R

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.