CVE-2021-34583: codesys Heap-based Buffer Overflow

Vulnerability summary

CVE-2021-34583 is a high (CVSS 7.5) Heap-based Buffer Overflow vulnerability in codesys. EPSS estimates a 8.84% chance of exploitation in the next 30 days, higher than 95.1% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 26-10-2021
   PublishedVulnerability first disclosed.
2. 16-09-2024
   Last modifiedVulnerability information updated.

Description

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.

• CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.