CVE-2020-37159Public exploit

Local code execution via oversized alarm name

Published Feb 6, 2026 · Updated Feb 6, 2026

Stack-based buffer overflow in Parallaxis Cuckoo Clock 5.0 allows local users to execute arbitrary code through an oversized alarm name. The New Alarm text box accepts an unchecked 260-plus-byte schedule name, overwriting EBP at offset 256 and EIP at offset 260. Exploitation requires local interaction with the Windows GUI; successful control-flow redirection runs code with the desktop application's privileges.

CVSS severity8.4
High
EPSS probability0.64%
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 Parallaxis Cuckoo Clock 5.0 allows local users to execute arbitrary code through an oversized alarm name. The New Alarm text box accepts an unchecked 260-plus-byte schedule name, overwriting EBP at offset 256 and EIP at offset 260. Exploitation requires local interaction with the Windows GUI; successful control-flow redirection runs code with the desktop application's privileges.

The record

CVE
CVE-2020-37159
Published
Feb 6, 2026
Updated
Feb 6, 2026
Vendor
Parallaxis Software
Product
Cuckoo Clock
Classifications
CWE-121, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 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=5.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Parallaxis Software · Cuckoo Clockversion=5.0

Published CVSS scores

8.4VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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