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.
Published 2023-07-11 17:15:13
Updated 2024-03-11 18:15:16
Source Red Hat, Inc.
View at NVD,   CVE.org
Vulnerability category: Memory CorruptionDenial of service

Threat overview for CVE-2023-3354

Top countries where our scanners detected CVE-2023-3354
Top open port discovered on systems with this issue 53
IPs affected by CVE-2023-3354 144,771
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2023-3354!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2023-3354

0.05%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 18 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2023-3354

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.5
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
NIST
7.5
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
Red Hat, Inc.

CWE ids for CVE-2023-3354

  • A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
    Assigned by:
    • nvd@nist.gov (Primary)
    • secalert@redhat.com (Secondary)

References for CVE-2023-3354

Products affected by CVE-2023-3354

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