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Fencer Vulns
high 7.5

CVE-2020-13238 json

Mitsubishi MELSEC iQ-R Series PLCs with firmware 33 allow attackers to halt the industrial process by sending an unauthenticated crafted pa…

published 2020-06-10 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-5507

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

Mitsubishi MELSEC iQ-R Series PLCs with firmware 33 allow attackers to halt the industrial process by sending an unauthenticated crafted packet over the network, because this denial of service attack consumes excessive CPU time. After halting, physical access to the PLC is required in order to restore production.

Vendor advisories

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

cisa ICSA-20-161-02 updated cvss 5.3

Mitsubishi Electric MELSEC iQ-R Series (Update C)

  • Mitsubishi Electric R00/01/02CPU <= 7 Mitsubishi Electric R04/08/16/32/120CPU R04/08/16/32/120ENCPU <= 39 Mitsubishi Electric R08/16/32/120PCPU <= 24 Mitsubishi Electric R08/16/32/120PSFCPU <= 05 Mitsubishi Electric R08/16/32/120SFCPU <= 20 Mitsubishi Electric RJ71EN71 <= 49
    affected: vendor fix, mitigation “R04/08/16/32/120CPU, R04/08/16/32/120ENCPU: Firmware Versions 40 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

3.42% chance of exploitation in the next 30 days, higher than 88% 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

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.