CVE-2023-23556
Published: 18 May 2023
Summary
CVE-2023-23556 is a critical-severity Out-of-bounds Write (CWE-787) vulnerability in Facebook Hermes. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 18.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-27656
Vulnerability details
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…
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Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.