CVE-2020-37167
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Bytecode Function Name Manipulation in ClamAV ClamBC Interpreter

Publication date: 2026-02-12

Last updated on: 2026-02-27

Assigner: VulnCheck

Description
ClamAV versions prior to 0.103.0-rc contain a vulnerability in function name processing through the ClamBC bytecode interpreter that allows attackers to manipulate bytecode function names. Attackers can exploit the weak input validation in function name encoding to potentially execute malicious bytecode or cause unexpected behavior in the ClamAV engine.
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Meta Information
Published
2026-02-12
Last Modified
2026-02-27
Generated
2026-06-16
AI Q&A
2026-02-13
EPSS Evaluated
2026-06-14
NVD
CVE-2020-37167
EUVD
EUVD-2020-31211
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
clamav clamav *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
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Executive Summary

This vulnerability exists in the ClamAV ClamBC bytecode interpreter, specifically in the function name processing. It allows attackers to manipulate bytecode function names due to weak input validation in function name encoding. As a result, attackers can potentially execute malicious bytecode or cause unexpected behavior within the ClamAV engine.

Impact Analysis

The vulnerability can lead to the execution of malicious bytecode or cause unexpected behavior in the ClamAV engine. This could compromise the security of systems using ClamAV by allowing attackers to bypass protections, execute unauthorized code, or disrupt normal antivirus operations.

Compliance Impact

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