# CVE-2021-20595: XML external entity in 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 > Remote unauthenticated attackers can exploit XML External Entity flaws in Mitsubishi air conditioning controllers to disclose data or cause denial of service. - **Severity:** High 8.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** No - **Published:** 13 Jul 2021 - **Updated:** 3 Aug 2024 - **Also known as:** GHSA-rmww-xfp2-vx9m ## What is CVE-2021-20595? CVE-2021-20595 is a high-severity vulnerability in 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, published on 13 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description 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. Weakness: CWE-611 (Improper Restriction of XML External Entity Reference) ## Which versions are affected by CVE-2021-20595? It affects 19 products. Products: Mitsubishi Ae-200a Firmware, Mitsubishi Ae-200e Firmware, Mitsubishi Ae-50a Firmware, Mitsubishi Ae-50e Firmware, Mitsubishi Ag-150a-a Firmware, Mitsubishi Ag-150a-J Firmware, Mitsubishi Cms-Rmd-J Firmware, Mitsubishi Eb-50gu-a Firmware, Mitsubishi Eb-50gu-J Firmware, Mitsubishi Ew-50a Firmware, Mitsubishi Ew-50e Firmware, Mitsubishi G-50a Firmware, Mitsubishi Gb-50a Firmware, Mitsubishi Gb-50ada-a Firmware, Mitsubishi Gb-50ada-J Firmware, Mitsubishi Pac-Yg50eca Firmware, Mitsubishi Te-200a Firmware, Mitsubishi Te-50a Firmware, Mitsubishi Tw-50a Firmware. ## How do I fix CVE-2021-20595? No fix has been published for CVE-2021-20595 yet. Limit exposure of the affected software until one is available. ## Is CVE-2021-20595 being exploited? There is no known exploitation of CVE-2021-20595 in the wild and no public exploit code. ## Other vulnerabilities in 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 - [CVE-2022-24296](https://insights.sbomify.com/CVE-2022-24296/): Weak cryptography in Air Conditioning System G-150AD; Air Conditioning System AG-150A-A; Air Conditioning System AG-150A-J; Air Conditioning System GB-50AD; Air Conditioning System GB-50ADA-A; Air Conditioning System GB-50ADA-J; Air Conditioning System EB-50GU-A; Air Conditioning System EB-50GU-J; Air Conditioning System AE-200J; Air Conditioning System AE-200A; Air Conditioning System AE-200E; Air Conditioning System AE-50J; Air Conditioning System AE-50A; Air Conditioning System AE-50E; Air Conditioning System EW-50J; Air Conditioning System EW-50A; Air Conditioning System EW-50E; Air Conditioning System TE-200A; Air Conditioning System TE-50A; Air Conditioning System TW-50A (high 7.5) - [CVE-2021-20593](https://insights.sbomify.com/CVE-2021-20593/): Auth bypass in Air Conditioning System/Centralized Controllers G-50A; GB-50A; 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 (high 7.1) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2021-20595 and fix it if it is affected. What it is: CVE-2021-20595 is a high-severity vulnerability in 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, published on 13 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2021-20595 in the wild and no public exploit code. Affected product: 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. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2021-20595/ (Markdown: https://insights.sbomify.com/CVE-2021-20595/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20595 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20595 - OSV: https://osv.dev/vulnerability/CVE-2021-20595 --- From sbomify Insights: https://insights.sbomify.com/CVE-2021-20595/ Summaries are generated and may contain mistakes; the official description above is the record.