CVE-2023-23759

Name: CVE-2023-23759
Creator: NVD / NIST
Published: 2023-05-18T22:15:09.597+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.72%

Last modified Jun 17, 2026

CVE-2023-23759 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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).. EPSS estimates a 0.72% chance of exploitation in the next 30 days.

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).

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.72%

49.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Facebook	Fizz	< 2023.01.30.00

References

https://github.com/facebookincubator/fizz/commit/8d3649841597bedfb6986c30431ebad0eb215265Patch
https://www.facebook.com/security/advisories/cve-2023-23759Patch, Vendor Advisory
https://github.com/facebookincubator/fizz/commit/8d3649841597bedfb6986c30431ebad0eb215265Patch
https://www.facebook.com/security/advisories/cve-2023-23759Patch, Vendor Advisory

Timeline

Published: May 18, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-23759?

How severe is CVE-2023-23759?

CVE-2023-23759 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.72% probability of exploitation in the next 30 days.

How do I fix CVE-2023-23759?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-23759?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST