CVE-2023-38653 - CVE House

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Status published High CVE-2023-38653

Multiple integer overflow vulnerabilities exist in the VZT vzt_rd_block_vch_decode dict...

7 CVSS

Vulnerability Description

Multiple integer overflow vulnerabilities exist in the VZT vzt_rd_block_vch_decode dict parsing functionality of GTKWave 3.3.115. A specially crafted .vzt file can lead to memory corruption. A victim would need to open a malicious file to trigger these vulnerabilities.This vulnerability concerns the integer overflow when num_time_ticks is zero.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Discovered by Claudio Bozzato of Cisco Talos.

References

More from GTKWave

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Multiple out-of-bounds write vulnerabilities exist in the LXT2 parsing functionality...

Multiple out-of-bounds write vulnerabilities exist in the LXT2 parsing functionality...

Multiple integer underflow vulnerabilities exist in the LXT2 lxt2_rd_iter_radix shift...

Multiple integer underflow vulnerabilities exist in the LXT2 lxt2_rd_iter_radix shift...

Multiple integer overflow vulnerabilities exist in the LXT2 num_dict_entries functionality...

Affected Vendor

GTKWave

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Affected Software

GTKWave

Vulnerable Versions:

3.3.115

Timeline

Official Publish: January 8th, 2024

Last Modified: November 4th, 2025

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application

T1068 Exploitation for Privilege Escalation

Privilege Escalation

T1055 Process Injection

Defense Evasion

T1105 Ingress Tool Transfer

Command and Control

T1499 Endpoint Denial of Service