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 exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.009 (59.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Facebook Hermes — versions 0
Weakness classification (CWE)
References
- www.facebook.com/security/advisories/cve-2023-23556 (Patch, Vendor Advisory)
- github.com/facebook/hermes/commit/a6dcafe6ded8e61658b40f5699878cd19a481f80 (Patch)
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.