CVE-2021-20609 is an uncontrolled resource consumption vulnerability affecting numerous Mitsubishi Electric MELSEC iQ-R, Q, and L Series CPUs, as well as MELIPC Series MI5122-VW. A remote, unauthenticated attacker can exploit this by sending specially crafted packets, leading to a denial-of-service (DoS) condition that requires a system reset for recovery. This vulnerability has a CVSS v3.1 score of 7.5 (HIGH), indicating a network-based attack with low complexity and high impact on availability, but no impact on confidentiality or integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 24CPE matchmatch criteria | cpe:2.3:o:mitsubishi:melsec_iq-r_r00_cpu_firmware:*:*:*:*:*:*:*:* | ||
<= 24CPE matchmatch criteria | cpe:2.3:o:mitsubishi:melsec_iq-r_r01_cpu_firmware:*:*:*:*:*:*:*:* | ||
<= 24CPE matchmatch criteria | cpe:2.3:o:mitsubishi:melsec_iq-r_r02_cpu_firmware:*:*:*:*:*:*:*:* | ||
<= 57CPE matchmatch criteria | cpe:2.3:o:mitsubishi:melsec_iq-r_r04_cpu_firmware:*:*:*:*:*:*:*:* | ||
<= 57CPE matchmatch criteria | cpe:2.3:o:mitsubishi:melsec_iq-r_r08_cpu_firmware:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.