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Fencer Vulns
high 8.2

CVE-2021-20595 json

Improper Restriction of XML External Entity Reference vulnerability in Mitsubishi Electric Air Conditioning System/Centralized Controllers…

published 2021-07-13 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8013

cvss
8.2
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

Improper Restriction of XML External Entity Reference vulnerability in Mitsubishi Electric Air Conditioning System/Centralized Controllers (G-50A Ver.3.35 and prior, GB-50A Ver.3.35 and prior, GB-24A Ver.9.11 and prior, AG-150A-A Ver.3.20 and prior, AG-150A-J Ver.3.20 and prior, GB-50ADA-A Ver.3.20 and prior, GB-50ADA-J Ver.3.20 and prior, EB-50GU-A Ver 7.09 and prior, EB-50GU-J Ver 7.09 and prior, AE-200A Ver 7.93 and prior, AE-200E Ver 7.93 and prior, AE-50A Ver 7.93 and prior, AE-50E Ver 7.93 and prior, EW-50A Ver 7.93 and prior, EW-50E Ver 7.93 and prior, TE-200A Ver 7.93 and prior, TE-50A Ver 7.93 and prior, TW-50A Ver 7.93 and prior, CMS-RMD-J Ver.1.30 and prior), Air Conditioning System/Expansion Controllers (PAC-YG50ECA Ver.2.20 and prior) and Air Conditioning System/BM adapter(BAC-HD150 Ver.2.21 and prior) allows a remote unauthenticated attacker to disclose some of data in the air conditioning system or cause a DoS condition by sending specially crafted packets.

Vendor advisories

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

cisa ICSA-21-182-05 updated cvss 9.3

Mitsubishi Electric Air Conditioning Systems

  • Mitsubishi Electric AE-50A <= 7.93 Mitsubishi Electric AE-50E <= 7.93 Mitsubishi Electric AE-200A <= 7.93 Mitsubishi Electric AE-200E <= 7.93 Mitsubishi Electric AG-150A-A <= 3.20 Mitsubishi Electric AG-150A-J <= 3.20
    +15 more products
    Mitsubishi Electric BAC-HD150 <= 2.21 Mitsubishi Electric CMS-RMD-J <= 1.30 Mitsubishi Electric EB-50GU-A <= 7.09 Mitsubishi Electric EB-50GU-J <= 7.09 Mitsubishi Electric EW-50A <= 7.93 Mitsubishi Electric EW-50E <= 7.93 Mitsubishi Electric G-50A <= 3.35 Mitsubishi Electric GB-24A <= 9.11 Mitsubishi Electric GB-50A <= 3.35 Mitsubishi Electric GB-50ADA-A <= 3.20 Mitsubishi Electric GB-50ADA-J <= 3.20 Mitsubishi Electric PAC-YG50ECA <= 2.20 Mitsubishi Electric TE-50A <= 7.93 Mitsubishi Electric TE-200A <= 7.93 Mitsubishi Electric TW-50A <= 7.93
    affected: vendor fix, mitigation “G-50A: Version 3.37 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

1.78% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
NVD 2.0 8.5 AV:N/AC:L/Au:N/C:P/I:N/A:C

Affected products

  • n/a Air Conditioning System/Centralized Controllers G-50A; GB-50A; GB-24A; AG-150A-A; AG-150A-J; GB-50ADA-A; GB-50ADA-J; EB-50GU-A; EB-50GU-J; AE-200A; AE-200E; AE-50A; AE-50E; EW-50A; EW-50E; TE-200A; TE-50A; TW-50A; CMS-RMD-J; Air Conditioning System/Expansion Controllers PAC-YG50ECA; Air Conditioning System/BM adapter BAC-HD150

Classification

Weakness
  • CWE-611 Improper Restriction of XML External Entity Reference

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.