CVE-2021-34595: codesys Use of Out-of-range Pointer Offset

Vulnerability summary

CVE-2021-34595 is a high (CVSS 8.1) Use of Out-of-range Pointer Offset vulnerability in codesys. EPSS estimates a 0.85% chance of exploitation in the next 30 days, higher than 57.6% of scored vulnerabilities.

Timeline

1. 26-10-2021
   PublishedVulnerability first disclosed.
2. 17-09-2024
   Last modifiedVulnerability information updated.

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.

• CWE-823Use of Out-of-range Pointer OffsetThe product performs pointer arithmetic on a valid pointer, but it uses an offset that can point outside of the intended range of valid memory locations for the resulting pointer.
• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.