What’s Vulnerable › Vulnerabilities

CVE-2023-23759

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-05-18 · updated 2026-06-17
• Weakness: CWE-617

Description

There is a vulnerability in the fizz library prior to v2023.01.30.00 where a CHECK failure can be triggered remotely. This behavior requires the client supported cipher advertisement changing between the original ClientHello and the second ClientHello, crashing the process (impact is limited to denial of service).

Affected products

• Facebook fizz: before 2023.01.30.00 — fixed in 2023.01.30.00

How to fix

Upgrade to a fixed version: Facebook fizz 2023.01.30.00. Check the vendor advisory for mitigations.

References

• https://github.com/facebookincubator/fizz/commit/8d3649841597bedfb6986c30431ebad0eb215265
• https://www.facebook.com/security/advisories/cve-2023-23759
• https://github.com/facebookincubator/fizz/commit/8d3649841597bedfb6986c30431ebad0eb215265
• https://www.facebook.com/security/advisories/cve-2023-23759

Get alerted when CVE-2023-23759 or the next vulnerability affects your stack