HOMEVULNERABILITIESCVE-2023-23759
HIGH

CVE-2023-23759

CWE-617Published: May 18, 2023· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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).

NVD Source

Technical Analysis

CVE-2023-23759 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

facebook1 product(s)
fizz
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

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

All References (4)

→
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

Quick Facts

CVE IDCVE-2023-23759
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-617
CISA KEVNo
Affected1 vendor(s)
PublishedMay 18, 2023

Related CVEs (CWE-617)

CVE-2019-9795
9.8
CVE-2020-3615
9.8
CVE-2020-6623
8.8
CVE-2020-6617
8.8
CVE-2020-12417
8.8
CVE-2020-6619
8.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-23759 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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