# 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 > Remote authenticated attackers can impersonate administrators to disclose and tamper with air conditioning system configurations due to flawed authentication implementation. - **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** No - **Published:** 13 Jul 2021 - **Updated:** 3 Aug 2024 - **Also known as:** GHSA-wwxr-fcr7-6w34 ## What is CVE-2021-20593? CVE-2021-20593 is a high-severity authentication bypass vulnerability 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, published on 13 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim. ### Official description Incorrect Implementation of Authentication Algorithm in Mitsubishi Electric Air Conditioning System/Centralized Controllers (G-50A Ver.2.50 to Ver. 3.35, GB-50A Ver.2.50 to Ver. 3.35, 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) and Air Conditioning System/Expansion Controllers (PAC-YG50ECA Ver.2.20 and prior) allows a remote authenticated attacker to impersonate administrators to disclose configuration information of the air conditioning system and tamper information (e.g. operation information and configuration of air conditioning system) by exploiting this vulnerability. Weakness: CWE-287 (Improper Authentication) ## Which versions are affected by CVE-2021-20593? 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-2021-20593? No fix has been published for CVE-2021-20593 yet. Limit exposure of the affected software until one is available. ## Is CVE-2021-20593 being exploited? There is no known exploitation of CVE-2021-20593 in the wild and no public exploit code. ## Other vulnerabilities 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 - [CVE-2021-20595](https://insights.sbomify.com/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 (high 8.2) - [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) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2021-20593 and fix it if it is affected. What it is: CVE-2021-20593 is a high-severity authentication bypass vulnerability 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, published on 13 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2021-20593 in the wild and no public exploit code. Affected product: 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. 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-2021-20593/ (Markdown: https://insights.sbomify.com/CVE-2021-20593/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20593 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20593 - OSV: https://osv.dev/vulnerability/CVE-2021-20593 --- From sbomify Insights: https://insights.sbomify.com/CVE-2021-20593/ Summaries are generated and may contain mistakes; the official description above is the record.