#VU54433 Use-after-free in hermes-engine - CVE-2021-24037

Vulnerability identifier: #VU54433

Vulnerability risk: Medium

CVSSv4.0: 4.4 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-24037

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
hermes-engine
Web applications / Modules and components for CMS

Vendor: Facebook Inc.

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error. A remote authenticated attacker can execute arbitrary code via a specially crafted JavaScript.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

hermes-engine: 0.0.0 - 0.6.0

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External links
https://www.facebook.com/security/advisories/CVE-2021-24037
https://github.com/facebook/hermes/commit/d86e185e485b6330216dee8e854455c694e3a36e

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.