Is CVE-2023-23556 actively exploited?

No active exploitation of CVE-2023-23556 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-23556 be exploited remotely?

Yes. CVE-2023-23556 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-23556?

CVE-2023-23556 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2023-23556

CRITICAL

CVE-2023-23556

CWE-787Published: May 18, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

An error in BigInt conversion to Number in Hermes prior to commit a6dcafe6ded8e61658b40f5699878cd19a481f80 could have been used by a malicious attacker to execute arbitrary code due to an out-of-bound write. Note that this bug is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.

NVD Source

Technical Analysis

CVE-2023-23556 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.