Code execution via wrapped signal-buffer allocation
Published Jan 8, 2024 · Updated Nov 4, 2025
Integer overflow in GTKWave 3.3.115 allows attackers to execute arbitrary code via a crafted FST waveform file. In fstReaderIterBlocks2, an unchecked 0xffffffff signal length wraps longest_signal_value_len + 1 to zero, producing an undersized temp_signal_value_buf allocation. Opening the file is required; later attacker-controlled signal data writes beyond that heap buffer and enables code execution in the user's process.
Summary
What happened
Integer overflow in GTKWave 3.3.115 allows attackers to execute arbitrary code via a crafted FST waveform file. In fstReaderIterBlocks2, an unchecked 0xffffffff signal length wraps longest_signal_value_len + 1 to zero, producing an undersized temp_signal_value_buf allocation. Opening the file is required; later attacker-controlled signal data writes beyond that heap buffer and enables code execution in the user's process.
The record
- CVE
- CVE-2023-36864
- Published
- Jan 8, 2024
- Updated
- Nov 4, 2025
- Vendor
- GTKWave
- Product
- GTKWave
- Classifications
- CWE-190, T1204.002, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 8, 2024CVE publishedPublication date reported by the CVE source.
- 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.
- Affected versionversion=3.3.115
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Cisco Talos crafted FST proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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