{"answers":{"affected":"It affects 5 products.","exploited":"There is no known exploitation of CVE-2021-25677 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-25677 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-25677 is a medium-severity vulnerability in Siemens APOGEE PXC Compact (BACnet), published on 22 Apr 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-2021-25677 and fix it if it is affected.\n\nWhat it is: CVE-2021-25677 is a medium-severity vulnerability in Siemens APOGEE PXC Compact (BACnet), published on 22 Apr 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-2021-25677 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-2021-25677/ (Markdown: https://insights.sbomify.com/CVE-2021-25677/index.md)","id":"CVE-2021-25677","markdown":"https://insights.sbomify.com/CVE-2021-25677/index.md","name":"CVE-2021-25677","record":{"aliases":["GHSA-596h-hvjh-ffpf"],"analysis":{"component_type":"ics_ot","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Siemens building automation","requires_auth":"none","summary":"Insufficient DNS transaction ID randomization allows attackers to poison DNS cache or spoof DNS resolution in Siemens building automation and network products.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"siemens","cpe":[{"product":"nucleus_net","vendor":"siemens"},{"product":"nucleus_readystart_v3","vendor":"siemens"},{"product":"nucleus_readystart_v4","vendor":"siemens"},{"product":"nucleus_source_code","vendor":"siemens"},{"product":"simotics_connect_400_firmware","vendor":"siemens"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C","version":"3.1"},"cwes":[{"id":"CWE-330","name":"Use of Insufficiently Random 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), Nucleus ReadyStart V3 (All versions \u003c V2017.02.3), Nucleus ReadyStart V3 (All versions \u003c V2017.02.4), Nucleus ReadyStart V4 (All versions \u003c V4.1.0), Nucleus Source Code (Versions including affected DNS modules), SIMOTICS CONNECT 400 (All versions \u003c V0.5.0.0), SIMOTICS CONNECT 400 (All versions \u003e= V0.5.0.0 \u003c V1.0.0.0), TALON TC Compact (BACnet) (All versions \u003c V3.5.5), TALON TC Modular (BACnet) (All versions \u003c V3.5.5). The DNS client does not properly randomize DNS transaction IDs. That could allow an attacker to poison the DNS cache or spoof DNS resolving.","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":"Other in APOGEE PXC Compact (BACnet)","id":"CVE-2021-25677","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"other","year":"2021"},"n_packages":0,"n_references":3,"next":{"headline":"Memory corruption in Solid Edge SE2020","id":"CVE-2021-25678"},"packages":[],"prev":{"headline":"Denial of service in RUGGEDCOM RM1224","id":"CVE-2021-25676"},"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 ReadyStart V4","Nucleus Source Code","SIMOTICS CONNECT 400","TALON TC Compact (BACnet)","TALON TC Modular (BACnet)"],"published":"2021-04-22","related":[{"cvss_score":8.1,"headline":"Memory corruption in APOGEE PXC Compact (BACnet)","id":"CVE-2020-15795","kev_date_added":null,"published":"2021-04-22"},{"cvss_score":8.1,"headline":"Memory corruption in APOGEE PXC Compact (BACnet)","id":"CVE-2020-27009","kev_date_added":null,"published":"2021-04-22"},{"cvss_score":6.5,"headline":"Memory corruption in APOGEE PXC Compact (BACnet)","id":"CVE-2020-27736","kev_date_added":null,"published":"2021-04-22"},{"cvss_score":6.5,"headline":"Memory corruption in APOGEE PXC Compact (BACnet)","id":"CVE-2020-27737","kev_date_added":null,"published":"2021-04-22"},{"cvss_score":6.5,"headline":"Memory corruption in APOGEE PXC Compact (BACnet)","id":"CVE-2020-27738","kev_date_added":null,"published":"2021-04-22"},{"cvss_score":5.3,"headline":"Other in Nucleus NET","id":"CVE-2021-27393","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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["Siemens"]},"summary":"Insufficient DNS transaction ID randomization allows attackers to poison DNS cache or spoof DNS resolution in Siemens building automation and network products.","url":"https://insights.sbomify.com/CVE-2021-25677/"}