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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.009 (57.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
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
- customers.codesys.com/index.php (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.