Is CVE-2023-5731 actively exploited?

No active exploitation of CVE-2023-5731 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-5731 be exploited remotely?

Yes. CVE-2023-5731 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-5731?

CVE-2023-5731 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2023-5731

CRITICAL

CVE-2023-5731

CWE-787Published: October 25, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Memory safety bugs present in Firefox 118. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 119.

NVD Source

Risk Analysis

Firefox 118 contains critical memory safety bugs that could lead to memory corruption and arbitrary code execution. These flaws represent a significant risk to user security.

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

Recommended Action

Update Firefox to version 119 or later.

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-2023-5731 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.

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