---
id: CVE-2025-51677
title: An issue was discovered in openRISC OR1200 commit 83ac6b
summary: >-
  An issue was discovered in openRISC OR1200 commit 83ac6b. An output mismatch
  between the RTL and the netlist of the or1200 cpu output port can lead to
  unexpected behavior.
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'
cwe:
  - CWE-116
published: '2026-07-17'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T09:10:00.323'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-51677'
references:
  - url: 'https://github.com/openrisc/mor1kx/issues/160#issuecomment-2585618940'
    label: cve@mitre.org
  - url: 'https://mason.gmu.edu/~rsaravan/projects/synfuzz/cve/cve.html'
    label: cve@mitre.org
  - url: 'https://www.arxiv.org/abs/2504.18812'
    label: cve@mitre.org
tags:
  - nvd
epss: 0.00626
epssPercentile: 0.48527
ingestedAt: '2026-10-13T09:20:23.174Z'
---

## Overview

An issue was discovered in openRISC OR1200 commit 83ac6b. An output mismatch between the RTL and the netlist of the or1200 cpu output port can lead to unexpected behavior.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.