CVE-2021-40507

CRITICAL

OpenRISC OR1200 Firmware 2011-09-10-2015-11-11 - Incorrect Overflow Flag Update in ALU Subtract Instruction

Title source: llm
STIX 2.1

Description

An issue was discovered in the ALU unit of the OR1200 (aka OpenRISC 1200) processor 2011-09-10 through 2015-11-11. The overflow flag is not being updated correctly for the subtract instruction, which results in an incorrect value in the overflow flag. Any software that relies on this flag may experience corruption in execution.

References (2)

Core 2

Scores

CVSS v3 9.8
EPSS 0.0073
EPSS Percentile 49.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-287
Status published
Products (1)
openrisc/or1200_firmware 2011-09-10 - 2015-11-11
Published Apr 18, 2023
Tracked Since Feb 18, 2026