{"answers":{"affected":"It affects 19 products.","exploited":"There is no known exploitation of CVE-2023-27991 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2023-27991 yet. Limit exposure of the affected software until one is available.","what":"CVE-2023-27991 is a high-severity command injection vulnerability in Zyxel ATP series firmware, published on 24 Apr 2023. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2023-27991 and fix it if it is affected.\n\nWhat it is: CVE-2023-27991 is a high-severity command injection vulnerability in Zyxel ATP series firmware, published on 24 Apr 2023. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2023-27991 in the wild and no public exploit code.\n\nAffected product: Zyxel ATP series firmware. 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-2023-27991/ (Markdown: https://insights.sbomify.com/CVE-2023-27991/index.md)","id":"CVE-2023-27991","markdown":"https://insights.sbomify.com/CVE-2023-27991/index.md","name":"CVE-2023-27991","record":{"aliases":["GHSA-2j4f-52m8-xq9h"],"analysis":{"component_type":"network_device","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Zyxel firewall firmware","requires_auth":"low_privilege","summary":"An authenticated attacker can execute arbitrary OS commands remotely via the CLI in Zyxel firewall firmware.","user_interaction":"not_required","vuln_class":"command_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Zyxel","cpe":[{"product":"atp100_firmware","vendor":"zyxel"},{"product":"atp100w_firmware","vendor":"zyxel"},{"product":"atp200_firmware","vendor":"zyxel"},{"product":"atp500_firmware","vendor":"zyxel"},{"product":"atp700_firmware","vendor":"zyxel"},{"product":"atp800_firmware","vendor":"zyxel"},{"product":"usg20-vpn_firmware","vendor":"zyxel"},{"product":"usg_20w-vpn_firmware","vendor":"zyxel"},{"product":"usg_flex_100_firmware","vendor":"zyxel"},{"product":"usg_flex_100w_firmware","vendor":"zyxel"},{"product":"usg_flex_200_firmware","vendor":"zyxel"},{"product":"usg_flex_500_firmware","vendor":"zyxel"},{"product":"usg_flex_50_firmware","vendor":"zyxel"},{"product":"usg_flex_50w_firmware","vendor":"zyxel"},{"product":"usg_flex_700_firmware","vendor":"zyxel"},{"product":"vpn1000_firmware","vendor":"zyxel"},{"product":"vpn100_firmware","vendor":"zyxel"},{"product":"vpn300_firmware","vendor":"zyxel"},{"product":"vpn50_firmware","vendor":"zyxel"}],"cvss":{"score":8.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-78","name":"Improper Neutralization of Special Elements used in an OS Command"}],"description":"The post-authentication command injection vulnerability in the CLI command of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.16 through 5.35, USG20(W)-VPN firmware versions 4.16 through 5.35, and VPN series firmware versions 4.30 through 5.35, which could allow an authenticated attacker to execute some OS commands remotely.","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":"Command injection in ATP series firmware","id":"CVE-2023-27991","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"command_injection","year":"2023"},"n_packages":0,"n_references":1,"next":{"headline":"Zyxel Multiple NAS Devices Command Injection","id":"CVE-2023-27992"},"packages":[],"prev":{"headline":"Cross-site scripting in ATP series firmware","id":"CVE-2023-27990"},"products":["ATP series firmware","USG FLEX 50(W) firmware","USG FLEX series firmware","USG20(W)-VPN firmware","VPN series firmware"],"published":"2023-04-24","related":[{"cvss_score":9.8,"headline":"Zyxel Multiple Firewalls Buffer Overflow","id":"CVE-2023-33009","kev_date_added":"2023-06-05","published":"2023-05-24"},{"cvss_score":9.8,"headline":"Zyxel Multiple Firewalls Buffer Overflow","id":"CVE-2023-33010","kev_date_added":"2023-06-05","published":"2023-05-24"},{"cvss_score":9.8,"headline":"Zyxel Multiple Firewalls OS Command Injection","id":"CVE-2023-28771","kev_date_added":"2023-05-31","published":"2023-04-25"},{"cvss_score":9.8,"headline":"Zyxel Multiple Firewalls OS Command Injection","id":"CVE-2022-30525","kev_date_added":"2022-05-16","published":"2022-05-12"},{"cvss_score":9.8,"headline":"Zyxel Multiple Products Use of Hard-Coded Credentials","id":"CVE-2020-29583","kev_date_added":"2021-11-03","published":"2020-12-22"},{"cvss_score":9.8,"headline":"Zyxel Multiple NAS Devices OS Command Injection","id":"CVE-2020-9054","kev_date_added":"2022-03-25","published":"2020-03-04"},{"cvss_score":9.8,"headline":"Auth bypass in ATP series firmware","id":"CVE-2022-0342","kev_date_added":null,"published":"2022-03-28"}],"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":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2025-02-04","vendors":["Zyxel"]},"summary":"An authenticated attacker can execute arbitrary OS commands remotely via the CLI in Zyxel firewall firmware.","url":"https://insights.sbomify.com/CVE-2023-27991/"}