Is CVE-2020-21047 actively exploited?

No active exploitation of CVE-2020-21047 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-21047 be exploited remotely?

No. CVE-2020-21047 requires local access to exploit.

What is the CVSS score of CVE-2020-21047?

CVE-2020-21047 has a CVSS score of 5.5 (MEDIUM).

HOME VULNERABILITIESCVE-2020-21047

MEDIUM

CVE-2020-21047

CWE-787Published: August 22, 2023· Updated: Jun 17, 2026

5.5

CVSS v3.1

Official Description

The libcpu component which is used by libasm of elfutils version 0.177 (git 47780c9e), suffers from denial-of-service vulnerability caused by application crashes due to out-of-bounds write (CWE-787), off-by-one error (CWE-193) and reachable assertion (CWE-617); to exploit the vulnerability, the attackers need to craft certain ELF files which bypass the missing bound checks.

NVD Source

Technical Analysis

CVE-2020-21047 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.

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