HOMEVULNERABILITIESCVE-2023-3354
HIGH

CVE-2023-3354

CWE-476Published: July 11, 2023· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

A flaw was found in the QEMU built-in VNC server. When a client connects to the VNC server, QEMU checks whether the current number of connections crosses a certain threshold and if so, cleans up the previous connection. If the previous connection happens to be in the handshake phase and fails, QEMU cleans up the connection again, resulting in a NULL pointer dereference issue. This could allow a remote unauthenticated client to cause a denial of service.

NVD Source

Technical Analysis

CVE-2023-3354 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

Fedora1 product(s)
fedora
qemu1 product(s)
qemu
Red Hat2 product(s)
openstack platformenterprise linux
Source: NVD CPE · 7 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
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Official Patches & Advisories

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=2216478
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=2216478
ADVISORYhttps://access.redhat.com/security/cve/CVE-2023-3354
ADVISORYhttps://access.redhat.com/security/cve/CVE-2023-3354

All References (8)

→
https://access.redhat.com/security/cve/CVE-2023-3354Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2216478Issue Tracking · Patch
→
https://lists.debian.org/debian-lts-announce/2024/03/msg00012.html
→
https://lists.fedoraproject.org/archives/list/[email protected]/message/MURWGXDIF2WTDXV36T6HFJDBL632AO7R/Mailing List
→
https://access.redhat.com/security/cve/CVE-2023-3354Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2216478Issue Tracking · Patch
→
https://lists.debian.org/debian-lts-announce/2024/03/msg00012.html
→
https://lists.fedoraproject.org/archives/list/[email protected]/message/MURWGXDIF2WTDXV36T6HFJDBL632AO7R/Mailing List

Quick Facts

CVE IDCVE-2023-3354
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-476
CISA KEVNo
Affected3 vendor(s)
PublishedJul 11, 2023

Related CVEs (CWE-476)

CVE-2010-2495
10.0
CVE-2022-36648
10.0
CVE-2020-5544
9.8
CVE-2019-16092
9.8
CVE-2019-10534
9.8
CVE-2019-17539
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-3354 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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