Is CVE-2021-33186 actively exploited?

No active exploitation of CVE-2021-33186 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-33186 be exploited remotely?

Yes. CVE-2021-33186 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-33186?

CVE-2021-33186 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2021-33186

HIGH

CVE-2021-33186

CWE-787Published: June 18, 2021· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

SerenityOS in test-crypto.cpp contains a stack buffer overflow which could allow attackers to obtain sensitive information.

NVD Source

Technical Analysis

CVE-2021-33186 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), with a CVSS base score of 7.5.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.