Bytecode Processing Vulnerability in ClamAV by Cisco
CVE-2020-37167

8.6HIGH

Key Information:

Vendor

Clamav

Status
Clambc
Vendor
CVE Published:
12 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2020-37167?

The ClamAV software by Cisco has a vulnerability in its ClamBC bytecode interpreter related to function name processing. This weakness arises from insufficient input validation during the encoding of bytecode function names. It allows attackers to manipulate these names, which could lead to the execution of malicious bytecode or unpredictable behavior of the ClamAV engine. Organizations using impacted versions of ClamAV are advised to review their configurations and apply necessary security protocols to mitigate potential exploitation.

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Affected Version(s)

ClamBC 0 < 0.103.0-rc

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2020-37167 - Proof of Concept

References

https://www.exploit-db.com/exploits/47687
exploit
https://github.com/Cisco-Talos/clamav/commit/cd2f2975b932...
patch
https://www.clamav.net/
product

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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