What is CVE-2023-43644?

CVE-2023-43644 is a critical-severity vulnerability in Sagernet Sing-Box, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2023-09-25.

How severe is CVE-2023-43644?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Sagernet Sing-Box

CVE-2023-43644

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.

Vulnerability class: Broken Authentication

EPSS: 0.007 (49.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Affected products

Sagernet Sing-box — versions >= 1.5.0-beta.1, < 1.5.0-rc.4, < 1.4.5, 1.5.0

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2023-43644?: CVE-2023-43644 is a critical-severity vulnerability in Sagernet Sing-Box, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2023-09-25.
How severe is CVE-2023-43644?: Critical severity. CVSS v3 base score is 9.1 out of 10.