{"answers":{"affected":"It affects 5 products.","exploited":"There is no known exploitation of CVE-2020-28388 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2020-28388 yet. Limit exposure of the affected software until one is available.","what":"CVE-2020-28388 is a medium-severity vulnerability in Siemens APOGEE PXC Compact (BACnet), published on 9 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2020-28388 and fix it if it is affected.\n\nWhat it is: CVE-2020-28388 is a medium-severity vulnerability in Siemens APOGEE PXC Compact (BACnet), published on 9 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2020-28388 in the wild and no public exploit code.\n\nAffected product: Siemens APOGEE PXC Compact (BACnet). No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. 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.\n2. 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.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2020-28388/ (Markdown: https://insights.sbomify.com/CVE-2020-28388/index.md)","id":"CVE-2020-28388","markdown":"https://insights.sbomify.com/CVE-2020-28388/index.md","name":"CVE-2020-28388","record":{"aliases":["GHSA-j6gp-g45q-2wm2"],"analysis":{"component_type":"ics_ot","fix_type":"upgrade","impacts":["account_takeover","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Siemens building automation","requires_auth":"none","summary":"Predictable TCP Initial Sequence Numbers allow attackers to hijack sessions or spoof connections in Siemens building automation systems.","user_interaction":"not_required","vuln_class":"weak_cryptography"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"siemens","cpe":[{"product":"capital_vstar","vendor":"siemens"},{"product":"nucleus_net","vendor":"siemens"},{"product":"nucleus_readystart","vendor":"siemens"},{"product":"nucleus_source_code","vendor":"siemens"},{"product":"pluscontrol_1st_gen","vendor":"siemens"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:P/RL:O/RC:C","version":"3.1"},"cwes":[{"id":"CWE-342","name":"Predictable Exact Value from Previous Values"}],"description":"A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions \u003c V3.5.5), APOGEE PXC Compact (P2 Ethernet) (All versions \u003c V2.8.20), APOGEE PXC Modular (BACnet) (All versions \u003c V3.5.5), APOGEE PXC Modular (P2 Ethernet) (All versions \u003c V2.8.20), Nucleus NET (All versions \u003c V5.2), Nucleus ReadyStart V3 (All versions \u003c V2012.12), Nucleus Source Code (All versions), PLUSCONTROL 1st Gen (All versions), TALON TC Compact (BACnet) (All versions \u003c V3.5.5), TALON TC Modular (BACnet) (All versions \u003c V3.5.5). Initial Sequence Numbers (ISNs) for TCP connections are derived from an insufficiently random source. As a result, the ISN of current and future TCP connections could be predictable. An attacker could hijack existing sessions or spoof future ones.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Weak cryptography in APOGEE PXC Compact (BACnet)","id":"CVE-2020-28388","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"weak_cryptography","year":"2020"},"n_packages":0,"n_references":4,"next":{"headline":"Information disclosure in Opcenter Execution Core","id":"CVE-2020-28390"},"packages":[],"prev":{"headline":"XML external entity in Solid Edge SE2020","id":"CVE-2020-28387"},"products":["APOGEE PXC Compact (BACnet)","APOGEE PXC Compact (P2 Ethernet)","APOGEE PXC Modular (BACnet)","APOGEE PXC Modular (P2 Ethernet)","Nucleus NET","Nucleus ReadyStart V3","Nucleus Source Code","PLUSCONTROL 1st Gen","TALON TC Compact (BACnet)","TALON TC Modular (BACnet)"],"published":"2021-02-09","related":[{"cvss_score":8.7,"headline":"Denial of service in Capital Embedded AR Classic 431-422","id":"CVE-2021-25663","kev_date_added":null,"published":"2021-04-22"},{"cvss_score":8.7,"headline":"Denial of service in Capital Embedded AR Classic 431-422","id":"CVE-2021-25664","kev_date_added":null,"published":"2021-04-22"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-02","vendors":["Siemens"]},"summary":"Predictable TCP Initial Sequence Numbers allow attackers to hijack sessions or spoof connections in Siemens building automation systems.","url":"https://insights.sbomify.com/CVE-2020-28388/"}