Critical severity · published May 18, 2023
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…
9.8
CVSS
0.9%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 59% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HE
Hermes · Facebook
before 2023-02-02 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-23556
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-23556
Patch
https://github.com/facebook/hermes/commit/a6dcafe6ded8e61658b40f5699878cd19a481f80
Patch
https://www.facebook.com/security/advisories/cve-2023-23556
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