CVE-2021-41614Public exploit

Unauthorized EPCR access via missing privilege check

Published Apr 18, 2023 · Updated Feb 6, 2025

Incorrect register permissions in the controller of OpenRISC mor1kx allow local users to read and write the supervisor-only EPCR. The logic in rtl/verilog/mor1kx_ctrl_cappuccino.v accepts l.mfspr and l.mtspr operations on EPCR after entry into user mode instead of enforcing supervisor privilege. Local user-mode code can therefore inspect or alter the saved exception return address and violate the processor privilege boundary.

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

What happened

Incorrect register permissions in the controller of OpenRISC mor1kx allow local users to read and write the supervisor-only EPCR. The logic in rtl/verilog/mor1kx_ctrl_cappuccino.v accepts l.mfspr and l.mtspr operations on EPCR after entry into user mode instead of enforcing supervisor privilege. Local user-mode code can therefore inspect or alter the saved exception return address and violate the processor privilege boundary.

The record

CVE
CVE-2021-41614
Published
Apr 18, 2023
Updated
Feb 6, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-276, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 18, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 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

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 exploitPublished

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1068Exploitation for Privilege Escalation

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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