CVE-2021-41612Public exploit

Execution corruption via incorrect subtract carry flag

Published Apr 18, 2023 · Updated Feb 6, 2025

Incorrect carry-flag logic in the OpenRISC mor1kx ALU allows context-dependent attackers to corrupt software execution after subtraction. The subtract path in rtl/verilog/mor1kx_execute_alu.v sets the carry flag for operand cases such as r1 greater than r3, when the flag must be cleared. Reachability requires software to use the erroneous flag in a control or data path after l.sub, where it can corrupt control flow or computed data.

CVSS severity8.8
High
EPSS probability1.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Incorrect carry-flag logic in the OpenRISC mor1kx ALU allows context-dependent attackers to corrupt software execution after subtraction. The subtract path in rtl/verilog/mor1kx_execute_alu.v sets the carry flag for operand cases such as r1 greater than r3, when the flag must be cleared. Reachability requires software to use the erroneous flag in a control or data path after l.sub, where it can corrupt control flow or computed data.

The record

CVE
CVE-2021-41612
Published
Apr 18, 2023
Updated
Feb 6, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1201
Attack vector
Unavailable
Privileges
Unavailable

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8CISA-ADPCVSS:3.1/AV:N/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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1201Core and Compute Issues

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo