{"id":"CVE-2023-43644","aliases":["GHSA-r5hm-mp3j-285g","GO-2023-2077"],"url":"https://o3.security/vulnerability/CVE-2023-43644","summary":"Improper authentication in the SOCKS5 inbound in sing-box","details":"Sing-box is an open source proxy system. Affected versions are subject to an authentication bypass when specially crafted requests are sent to sing-box. This affects all SOCKS5 inbounds with user authentication and an attacker may be able to bypass authentication. Users are advised to update to sing-box 1.4.4 or to 1.5.0-rc.4. Users unable to update should not expose the SOCKS5 inbound to insecure environments.","published":"2023-09-25T19:12:35.949Z","modified":"2026-07-15T01:48:53.150836125Z","cvss":{"score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/sagernet/sing-box","fixedVersion":"1.4.5"},{"ecosystem":"Go","name":"github.com/sagernet/sing-box","fixedVersion":"1.5.0-rc.5"},{"ecosystem":"Go","name":"github.com/sagernet/sing","fixedVersion":"0.2.12-0.20230925092853-5b05b5c147d9"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43644.json"},{"type":"ADVISORY","url":"https://github.com/SagerNet/sing-box/security/advisories/GHSA-r5hm-mp3j-285g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-43644"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:48:53.150836125Z"}}