CVE-2023-39413

Memory corruption via underflowed left-shift length

Published Jan 8, 2024 · Updated Nov 4, 2025

Integer underflow in GTKWave 3.3.115 allows context-dependent attackers to corrupt memory via a crafted LXT2 waveform file. The lxt2_rd_iter_radix left-shift case subtracts one from an attacker-controlled zero signal length and passes the resulting size of -1 to memmove, causing a massive copy. A victim must open the file in the GUI or an affected utility; Talos demonstrated a crash and identified arbitrary code execution as an undemonstrated possibility.

CVSS severity7.0
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in GTKWave 3.3.115 allows context-dependent attackers to corrupt memory via a crafted LXT2 waveform file. The lxt2_rd_iter_radix left-shift case subtracts one from an attacker-controlled zero signal length and passes the resulting size of -1 to memmove, causing a massive copy. A victim must open the file in the GUI or an affected utility; Talos demonstrated a crash and identified arbitrary code execution as an undemonstrated possibility.

The record

CVE
CVE-2023-39413
Published
Jan 8, 2024
Updated
Nov 4, 2025
Vendor
GTKWave
Product
GTKWave
Classifications
CWE-191, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.3.115

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

GTKWave · GTKWaveversion=3.3.115

Published CVSS scores

7.0Cisco TalosCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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