What is CVE-2021-34584?

CVE-2021-34584 is a critical-severity vulnerability in Codesys, classified under Buffer Over-read. CVSS score: 9.1/10. Published 2021-10-26.

How severe is CVE-2021-34584?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Codesys

CVE-2021-34584

Crafted web server requests can be utilised to read partial stack or heap memory or may trigger a denial-of- service condition due to a crash in the CODESYS V2 web server prior to V1.1.9.22.

EPSS: 0.011 (60.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Affected products

Codesys
Codesys V2 — versions all web servers
Wago 750-8202
Wago 750-8202_firmware
Wago 750-8203
Wago 750-8203_firmware
Wago 750-8204
Wago 750-8204_firmware
Wago 750-8206
Wago 750-8206_firmware

Weakness classification (CWE)

CWE-126 — Buffer Over-read

References

info@cert.vde.com (x_refsource_CONFIRM, Vendor Advisory)
info@cert.vde.com (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-34584?: CVE-2021-34584 is a critical-severity vulnerability in Codesys, classified under Buffer Over-read. CVSS score: 9.1/10. Published 2021-10-26.
How severe is CVE-2021-34584?: Critical severity. CVSS v3 base score is 9.1 out of 10.