Code execution via unchecked LZMA block length
Published Jan 8, 2024 · Updated Nov 4, 2025
Out-of-bounds write in GTKWave 3.3.115 allows attackers to execute arbitrary code by inducing a user to open a crafted VZT file. In LZMA_read, the parser allocates the heap dmem buffer using the file-controlled dstlen value, then reads srclen bytes into it without checking that srclen does not exceed dstlen. The issue requires user interaction; the GTKWave GUI, vzt2vcd, and vztminer all reach the affected VZT parser, and successful exploitation runs code in the user's context.
Summary
What happened
Out-of-bounds write in GTKWave 3.3.115 allows attackers to execute arbitrary code by inducing a user to open a crafted VZT file. In LZMA_read, the parser allocates the heap dmem buffer using the file-controlled dstlen value, then reads srclen bytes into it without checking that srclen does not exceed dstlen. The issue requires user interaction; the GTKWave GUI, vzt2vcd, and vztminer all reach the affected VZT parser, and successful exploitation runs code in the user's context.
The record
- CVE
- CVE-2023-37282
- Published
- Jan 8, 2024
- Updated
- Nov 4, 2025
- Vendor
- GTKWave
- Product
- GTKWave
- Classifications
- CWE-787, CWE-119, T1203, T1204.002
- 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 malformed VZT crash demonstrationproof of concept · demonstrated
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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