# CVE-2023-28766: Null dereference in SIPROTEC 5 6MD85 (CP300) > A null pointer dereference in Siemens SIPROTEC 5 devices allows attackers to cause a denial of service condition. - **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** No - **Published:** 11 Apr 2023 - **Updated:** 11 Nov 2025 - **Also known as:** GHSA-frg8-xf9g-3fjf ## What is CVE-2023-28766? CVE-2023-28766 is a high-severity vulnerability in Siemens SIPROTEC 5 6MD85 (CP300), published on 11 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description A vulnerability has been identified in SIPROTEC 5 6MD85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 6MD86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 6MD89 (CP300) (All versions >= V7.80 < V9.64), SIPROTEC 5 6MU85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7KE85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SA82 (CP100) (All versions < V8.90), SIPROTEC 5 7SA82 (CP150) (All versions < V9.40), SIPROTEC 5 7SA86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SA87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SD82 (CP100) (All versions < V8.90), SIPROTEC 5 7SD82 (CP150) (All versions < V9.40), SIPROTEC 5 7SD86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SD87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SJ81 (CP100) (All versions < V8.89), SIPROTEC 5 7SJ81 (CP150) (All versions < V9.40), SIPROTEC 5 7SJ82 (CP100) (All versions < V8.89), SIPROTEC 5 7SJ82 (CP150) (All versions < V9.40), SIPROTEC 5 7SJ85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SJ86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SK82 (CP100) (All versions < V8.89), SIPROTEC 5 7SK82 (CP150) (All versions < V9.40), SIPROTEC 5 7SK85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SL82 (CP100) (All versions < V8.90), SIPROTEC 5 7SL82 (CP150) (All versions < V9.40), SIPROTEC 5 7SL86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SL87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SS85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7ST85 (CP300) (All versions >= V7.80 < V9.64), SIPROTEC 5 7ST86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SX82 (CP150) (All versions < V9.40), SIPROTEC 5 7SX85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7UM85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7UT82 (CP100) (All versions < V8.90), SIPROTEC 5 7UT82 (CP150) (All versions < V9.40), SIPROTEC 5 7UT85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7UT86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7UT87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7VE85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7VK87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7VU85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 Communication Module ETH-BA-2EL (Rev.1) (All versions < V9.40 installed on CP150 and CP300 devices), SIPROTEC 5 Communication Module ETH-BA-2EL (Rev.1) (All versions < V8.89 installed on CP100 devices), SIPROTEC 5 Communication Module ETH-BB-2FO (Rev. 1) (All versions < V9.40 installed on CP150 and CP300 devices), SIPROTEC 5 Communication Module ETH-BB-2FO (Rev. 1) (All versions < V8.89 installed on CP100 devices), SIPROTEC 5 Communication Module ETH-BD-2FO (All versions < V9.40), SIPROTEC 5 Compact 7SX800 (CP050) (All versions < V9.40). Affected devices lack proper validation of http request parameters of the hosted web service. An unauthenticated remote attacker could send specially crafted packets that could cause denial of service condition of the target device. Weakness: CWE-476 (NULL Pointer Dereference) ## Which versions are affected by CVE-2023-28766? It affects 39 products. Products: Siemens Siprotec 5 6md85 Firmware, Siemens Siprotec 5 6md86 Firmware, Siemens Siprotec 5 6md89 Firmware, Siemens Siprotec 5 6mu85 Firmware, Siemens Siprotec 5 7ke85 Firmware, Siemens Siprotec 5 7sa82 Firmware, Siemens Siprotec 5 7sa84 Firmware, Siemens Siprotec 5 7sa86 Firmware, Siemens Siprotec 5 7sa87 Firmware, Siemens Siprotec 5 7sd82 Firmware, Siemens Siprotec 5 7sd84 Firmware, Siemens Siprotec 5 7sd86 Firmware, Siemens Siprotec 5 7sd87 Firmware, Siemens Siprotec 5 7sj81 Firmware, Siemens Siprotec 5 7sj82 Firmware, Siemens Siprotec 5 7sj85 Firmware, Siemens Siprotec 5 7sj86 Firmware, Siemens Siprotec 5 7sk82 Firmware, Siemens Siprotec 5 7sk85 Firmware, Siemens Siprotec 5 7sl82 Firmware and 19 more. ## How do I fix CVE-2023-28766? No fix has been published for CVE-2023-28766 yet. Limit exposure of the affected software until one is available. ## Is CVE-2023-28766 being exploited? There is no known exploitation of CVE-2023-28766 in the wild and no public exploit code. ## Other vulnerabilities in Siemens SIPROTEC 5 6MD85 (CP300) - [CVE-2022-45044](https://insights.sbomify.com/CVE-2022-45044/): Denial of service in SIPROTEC 5 6MD84 (CP300) (medium 5.3) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2023-28766 and fix it if it is affected. What it is: CVE-2023-28766 is a high-severity vulnerability in Siemens SIPROTEC 5 6MD85 (CP300), published on 11 Apr 2023. 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-2023-28766 in the wild and no public exploit code. Affected product: Siemens SIPROTEC 5 6MD85 (CP300). 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-2023-28766/ (Markdown: https://insights.sbomify.com/CVE-2023-28766/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2023-28766 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-28766 - OSV: https://osv.dev/vulnerability/CVE-2023-28766 --- From sbomify Insights: https://insights.sbomify.com/CVE-2023-28766/ Summaries are generated and may contain mistakes; the official description above is the record.