CVE-2023-39414

Memory corruption via underflowed right-shift copy

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 file. In lxt2_rd_iter_radix, a zero signal length makes len minus one underflow, so memmove receives a size of negative one and performs an oversized copy. A victim must open the malicious file; the copy corrupts process memory, producing a crash and exposing an arbitrary-code-execution path.

CVSS severity7.0
High
EPSS probability0.37%
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 file. In lxt2_rd_iter_radix, a zero signal length makes len minus one underflow, so memmove receives a size of negative one and performs an oversized copy. A victim must open the malicious file; the copy corrupts process memory, producing a crash and exposing an arbitrary-code-execution path.

The record

CVE
CVE-2023-39414
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?

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  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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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.

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Technologies

Your stack

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Your stack

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