What is CVE-2023-23557?

CVE-2023-23557 is a critical-severity vulnerability in Facebook Hermes, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 9.8/10. Published 2023-05-18.

How severe is CVE-2023-23557?

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

Vulnerability in Facebook Hermes

CVE-2023-23557

An error in Hermes' algorithm for copying objects properties prior to commit a00d237346894c6067a594983be6634f4168c9ad could be used by a malicious attacker to execute arbitrary code via type confusion. Note that this is only exploitable in…

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-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

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

Frequently asked questions

What is CVE-2023-23557?: CVE-2023-23557 is a critical-severity vulnerability in Facebook Hermes, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 9.8/10. Published 2023-05-18.
How severe is CVE-2023-23557?: Critical severity. CVSS v3 base score is 9.8 out of 10.