Vulnerability identifier: #VU84561

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-6859

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers
Firefox ESR
Client/Desktop applications / Web browsers
Firefox for Android
Mobile applications / Apps for mobile phones

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error in PR_GetIdentitiesLayer when creating the TLS socket. A remote attacker can trick the victim to visit a specially crafted website and crash the browser.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 100.0 - 120.0.1

Firefox ESR: 115.0 - 115.5.0, 102.0 - 102.15.1

Firefox for Android: 66.0.4 - 120.1.1

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2023-54/
http://www.mozilla.org/en-US/security/advisories/mfsa2023-56/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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