What is CVE-2023-23556?

CVE-2023-23556 is a critical-severity vulnerability in Facebook Hermes, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2023-05-18.

How severe is CVE-2023-23556?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Facebook Hermes

CVE-2023-23556

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 expl…

Vulnerability class: Buffer Overflow

EPSS: 0.009 (55.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Facebook Hermes — versions 0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

cve-assign@fb.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
cve-assign@fb.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2023-23556?: CVE-2023-23556 is a critical-severity vulnerability in Facebook Hermes, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2023-05-18.
How severe is CVE-2023-23556?: Critical severity. CVSS v3 base score is 9.8 out of 10.