Is CVE-2023-21218 actively exploited?

No active exploitation of CVE-2023-21218 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-21218 be exploited remotely?

Yes. CVE-2023-21218 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-21218?

CVE-2023-21218 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2023-21218

CRITICAL

CVE-2023-21218

NVD-CWE-noinfoPublished: December 4, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

In PMRChangeSparseMemOSMem of physmem_osmem_linux.c, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local escalation of privilege in the kernel with no additional execution privileges needed. User interaction is not needed for exploitation.

NVD Source

Risk Analysis

This vulnerability involves an out-of-bounds write in the kernel caused by incorrect bounds checking, leading to potential local privilege escalation. It is rated as critical with a CVSS score of 9.8.

No public exploit is known, and it is not in the CISA KEV. It is remotely exploitable.

Recommended Action

Ensure Android devices are updated with the latest security patches.

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-2023-21218 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.