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CVE-2021-34595

HIGHCVSS 8.1/10EPSS 0.85%

Last modified

CVE-2021-34595 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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 estimates a 0.85% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
8.1/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

EPSS Probability
0.85%

53.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
Wago750-823 Firmware< fw10
Wago750-829 Firmware< fw17
Wago750-831 Firmware< fw17
Wago750-832 Firmware< fw10
Wago750-852 Firmware< fw17
Wago750-862 Firmware< fw10
Wago750-880 Firmware< fw17
Wago750-881 Firmware< fw17
Wago750-882 Firmware< fw17
Wago750-885 Firmware< fw17
Wago750-889 Firmware< fw17
Wago750-890 Firmware< fw10
Wago750-891 Firmware< fw10
Wago750-893 Firmware< fw10
Wago750-8202 Firmware< fw20
Wago750-8203 Firmware< fw20
Wago750-8204 Firmware< fw20
Wago750-8206 Firmware< fw20
Wago750-8207 Firmware< fw20
Wago750-8208 Firmware< fw20
Wago750-8210 Firmware< fw20
Wago750-8211 Firmware< fw20
Wago750-8212 Firmware< fw20
Wago750-8213 Firmware< fw20
Wago750-8214 Firmware< fw20
Wago750-8216 Firmware< fw20
Wago750-8217 Firmware< fw20
CodesysCodesys< 1.1.9.22
CodesysPlcwinnt< 2.4.7.56
CodesysRuntime Toolkit< 2.4.7.56

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is 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.
How severe is CVE-2021-34595?
CVE-2021-34595 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.85% probability of exploitation in the next 30 days.
How do I fix CVE-2021-34595?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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Source: NVD / NIST