{"id":"CVE-2023-43644","aliases":["EUVD-2023-2582","GHSA-r5hm-mp3j-285g","GO-2023-2077"],"status":"published","title":"Improper authentication in the SOCKS5 inbound in sing-box","description":"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.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00823,"percentile":0.57765,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-306"],"published":"2023-09-25T19:12:35Z","modified":"2026-10-28T02:30:52Z","fixes":[{"ecosystem":"Go","package":"github.com/sagernet/sing-box","fixed_in":["1.4.5","1.5.0-rc.5"],"sources":["ghsa","osv"]},{"ecosystem":"Go","package":"github.com/sagernet/sing","fixed_in":["0.2.12-0.20230925092853-5b05b5c147d9"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/sagernet/sing-box","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.5"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/sagernet/sing-box","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.5.0-beta.1"},{"fixed":"1.5.0-rc.5"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/sagernet/sing","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.2.12-0.20230925092853-5b05b5c147d9"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/sagernet/sing-box","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.4.5"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/sagernet/sing-box","ranges":[{"type":"SEMVER","events":[{"introduced":"1.5.0-beta.1"},{"fixed":"1.5.0-rc.5"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/sagernet/sing","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.2.12-0.20230925092853-5b05b5c147d9"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/sagernet/sing","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.2.12-0.20230925092853-5b05b5c147d9"}]}]}],"products":[{"vendor":"sagernet","product":"sing-box"}],"references":[{"url":"https://github.com/SagerNet/sing-box/security/advisories/GHSA-r5hm-mp3j-285g","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-43644","tags":["advisory"]},{"url":"https://github.com/SagerNet/sing-box/commit/9891fd672f5da9f20f59a1693271a946727f49e2","tags":["web"]},{"url":"https://github.com/SagerNet/sing-box/releases/tag/v1.4.5","tags":["web"]},{"url":"https://github.com/SagerNet/sing/commit/5b05b5c147d9650e8accb4441e216c72a61f4859","tags":["web","fix"]},{"url":"https://github.com/advisories/GHSA-r5hm-mp3j-285g"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43644.json","tags":["advisory"]},{"url":"https://github.com/SagerNet/sing-box","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-43644","title":"Improper authentication in the SOCKS5 inbound in sing-box","description":"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.","status":"published","published":"2023-09-25T19:12:35.949Z","modified":"2024-09-24T19:29:54.599Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:35:14.633899Z"}],"euvd":[{"id":"EUVD-2023-2582","description":"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.","status":"published","published":"2023-09-25T19:12:35Z","modified":"2024-09-24T19:29:54Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"}],"updated_at":"2026-11-03T00:28:14.929509Z"}],"ghsa":[{"id":"GHSA-r5hm-mp3j-285g","title":"sing-box vulnerable to improper authentication in the SOCKS inbound","description":"### Impact\n\nThis vulnerability allows specially crafted requests to bypass authentication, affecting all SOCKS inbounds with user authentication.\n\n### Patches\n\nUpdate to sing-box 1.4.5 or 1.5.0-rc.5 and later versions.\n\n### Workarounds\n\nDon't expose the SOCKS5 inbound to insecure environments.\n","status":"published","published":"2023-09-26T19:35:39Z","modified":"2023-11-06T05:02:05Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:37:14.234712Z"}],"nvd":[{"id":"CVE-2023-43644","description":"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.","status":"published","published":"2023-09-25T20:15:11.977Z","modified":"2026-06-17T06:26:08.493Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:08:31.699785Z"}],"osv":[{"id":"CVE-2023-43644","title":"Improper authentication in the SOCKS5 inbound in sing-box","description":"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.","status":"published","published":"2023-09-25T19:12:35.949Z","modified":"2026-10-28T02:30:52.974832051Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T15:44:33.792101Z"},{"id":"GHSA-r5hm-mp3j-285g","title":"sing-box vulnerable to improper authentication in the SOCKS inbound","description":"### Impact\n\nThis vulnerability allows specially crafted requests to bypass authentication, affecting all SOCKS inbounds with user authentication.\n\n### Patches\n\nUpdate to sing-box 1.4.5 or 1.5.0-rc.5 and later versions.\n\n### Workarounds\n\nDon't expose the SOCKS5 inbound to insecure environments.\n","status":"published","published":"2023-09-26T19:35:39Z","modified":"2026-09-10T03:50:03.205884551Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T15:46:55.480549Z"},{"id":"GO-2023-2077","title":"Authentication bypass in github.com/sagernet/sing","description":"Authentication bypass in github.com/sagernet/sing","status":"published","published":"2023-10-02T18:39:20Z","modified":"2024-05-20T16:03:47Z","updated_at":"2026-11-02T15:47:01.185262Z"}]}}