CVE-2021-40507 is a critical vulnerability affecting the ALU unit of the OpenRISC 1200 processor (versions 2011-09-10 through 2015-11-11) and its firmware. It stems from an incorrect update of the overflow flag during subtract instructions, potentially leading to execution corruption in software relying on this flag. With a CVSS score of 9.8 (CRITICAL), this vulnerability is remotely exploitable with low attack complexity, allowing for high impact across confidentiality, integrity, and availability. Currently, there is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2011-09-10, <= 2015-11-11CPE matchmatch criteria | cpe:2.3:o:openrisc:or1200_firmware:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.