CVE-2021-26561: synology diskstation_manager Stack-based Buffer Overflow

Vulnerability summary

CVE-2021-26561 is a critical (CVSS 9.0) Stack-based Buffer Overflow vulnerability in synology diskstation_manager. EPSS estimates a 2.06% chance of exploitation in the next 30 days, higher than 81% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 26-02-2021
   PublishedVulnerability first disclosed.
2. 16-09-2024
   Last modifiedVulnerability information updated.

Description

Stack-based buffer overflow vulnerability in synoagentregisterd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary code via syno_finder_site HTTP header.

• CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
• 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.