Buffer overflow in Codesys
CVE-2021-34595
A crafted request with invalid offsets may cause an out-of-bounds read or write access in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, resulting in a denial-of-service condition or local memory overwrite.
EPSS: 0.009 (53.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
Affected products
- Codesys
- Codesys V2 — versions Runtime Toolkit 32 bit full, PLCWinNT
- Codesys Plcwinnt
- Codesys Runtime_toolkit
- Wago 750-8202
- Wago 750-8202_firmware
- Wago 750-8203
- Wago 750-8203_firmware
- Wago 750-8204
- Wago 750-8204_firmware
Weakness classification (CWE)
References
- info@cert.vde.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-34595?
- CVE-2021-34595 is a high-severity vulnerability in Codesys, classified under CWE-823. CVSS score: 8.1/10. Published 2021-10-26.
- How severe is CVE-2021-34595?
- High severity. CVSS v3 base score is 8.1 out of 10.