Is CVE-2023-51771 actively exploited?

No active exploitation of CVE-2023-51771 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-51771 be exploited remotely?

Yes. CVE-2023-51771 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-51771?

CVE-2023-51771 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2023-51771

CRITICAL

CVE-2023-51771

CWE-120Published: December 25, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

In MicroHttpServer (aka Micro HTTP Server) through a8ab029, _ParseHeader in lib/server.c allows a one-byte recv buffer overflow via a long URI.

NVD Source

Risk Analysis

MicroHttpServer contains a one-byte buffer overflow in the header parsing logic, which can be triggered by a long URI. This critical vulnerability is rated 9.8 and could potentially lead to remote code execution.

No public exploit is known for this vulnerability, and it is not in the CISA KEV. It is remotely exploitable with low complexity.

Recommended Action

Apply patches provided by the maintainer of MicroHttpServer to address the buffer overflow.

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-2023-51771 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.