CVE-2020-37121Public exploit

Application crash via Unicode SEH overwrite

Published Feb 5, 2026 · Updated Feb 5, 2026

Stack-based buffer overflow in Code::Blocks 16.01 allows attackers to crash the application through a crafted M3U playlist file. Published material does not identify the parser function or copy operation; the proof of concept places SEH control data after 536 Unicode padding bytes. Exploitation requires a user to open the file on Windows; arbitrary code execution remains unverified because the public payload uses a breakpoint placeholder.

CVSS severity6.7
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Code::Blocks 16.01 allows attackers to crash the application through a crafted M3U playlist file. Published material does not identify the parser function or copy operation; the proof of concept places SEH control data after 536 Unicode padding bytes. Exploitation requires a user to open the file on Windows; arbitrary code execution remains unverified because the public payload uses a breakpoint placeholder.

The record

CVE
CVE-2020-37121
Published
Feb 5, 2026
Updated
Feb 5, 2026
Vendor
Code::Blocks
Product
Code::Blocks
Classifications
CWE-121, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 5, 2026Record 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.

  1. Affected versionversion=16.01

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Code::Blocks · Code::Blocksversion=16.01

Published CVSS scores

6.7VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.7UbuntuCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

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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