What is CVE-2021-34583?

CVE-2021-34583 is a high-severity vulnerability in Codesys, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2021-10-26.

How severe is CVE-2021-34583?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Codesys

CVE-2021-34583

Crafted web server requests may cause a heap-based buffer overflow and could therefore trigger a denial-of- service condition due to a crash in the CODESYS V2 web server prior to V1.1.9.22.

Vulnerability class: Buffer Overflow

EPSS: 0.084 (94.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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-122 — Heap-based Buffer Overflow
CWE-787 — Out-of-bounds Write

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-2021-34583?: CVE-2021-34583 is a high-severity vulnerability in Codesys, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2021-10-26.
How severe is CVE-2021-34583?: High severity. CVSS v3 base score is 7.5 out of 10.