Is CVE-2023-43644 actively exploited?

No active exploitation of CVE-2023-43644 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-43644 be exploited remotely?

Yes. CVE-2023-43644 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-43644?

CVE-2023-43644 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2023-43644

CWE-306Published: September 25, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

NVD Source

Risk Analysis

Sing-box is affected by an authentication bypass vulnerability in its SOCKS5 inbound implementation. Unauthenticated attackers can bypass authentication requirements, potentially leading to unauthorized proxy usage.

No public exploit is known, and it is not in the KEV catalog. The vulnerability is remotely exploitable.

Recommended Action

Update to sing-box version 1.4.4 or 1.5.0-rc.4. If updating is not possible, avoid exposing SOCKS5 inbounds to insecure environments.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2023-43644 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.