CVE-2023-23557

moderate-risk
Published 2023-05-18

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 cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.

Do I need to act?

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0.77% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Facebook

References (4)

Patch https://github.com/facebook/hermes/commit/a00d237346894c6067a594983be6634f4168c9...
Patch https://www.facebook.com/security/advisories/cve-2023-23557
Patch https://github.com/facebook/hermes/commit/a00d237346894c6067a594983be6634f4168c9...
Patch https://www.facebook.com/security/advisories/cve-2023-23557
40
/ 100
moderate-risk
Severity 32/34 · Critical
Exploitability 3/34 · Minimal
Exposure 5/34 · Minimal