CVE-2023-36377

Local arbitrary code execution

Published Jul 3, 2023 · Updated Dec 30, 2025

Buffer overflow in mtrojnar osslsigncode before 2.3 allows local users to execute arbitrary code by processing a crafted PE file. The upstream release identifies multiple memory-corruption fixes but does not disclose the affected function, buffer, or unchecked copy operation for this CVE. Execution requires local access and occurs with the privileges of the osslsigncode process when an untrusted EXE, SYS, or DLL file is signed.

CVSS severity7.8
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in mtrojnar osslsigncode before 2.3 allows local users to execute arbitrary code by processing a crafted PE file. The upstream release identifies multiple memory-corruption fixes but does not disclose the affected function, buffer, or unchecked copy operation for this CVE. Execution requires local access and occurs with the privileges of the osslsigncode process when an untrusted EXE, SYS, or DLL file is signed.

The record

CVE
CVE-2023-36377
Published
Jul 3, 2023
Updated
Dec 30, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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