CVE intelligence and bounded remediation
CVE-2021-26562 — Synology Diskstation Manager security vulnerability
Critical
CVSS 9
Out-of-bounds write 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.
- Severity
- Critical
- CVSS
- 9 (3.1)
- Published
- 2021-02-26
- CISA KEV
- Not currently listed
- Ecosystem
- operating-system
- Weaknesses
- CWE-787
Affected products
- synology / diskstation_manager
- synology / vs960hd_firmware
- synology / skynas_firmware
- synology / diskstation_manager_unified_controller / 3.0
Matched remediation archetype
Buffer bounds, memory safety, and memory corruption
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Check exposure
- Identify affected native-code versions, build flags, architectures, parsers, codecs, drivers, and input paths in all shipped artifacts.
- Determine whether untrusted data reaches the affected routine and the process privilege, sandbox, and network exposure.
- Confirm statically linked, vendored, firmware, and platform-provided copies, not only package-manager records.
Remediate safely
- Apply the maintained upstream correction or replace the affected component, then rebuild every dependent artifact from clean inputs.
- Adopt bounds-checked interfaces, validated sizes and integer conversions, clear ownership, and memory-safe components where practical.
- Enable supported compiler and runtime hardening and add sanitized tests and fuzz regression seeds derived from non-weaponized fixtures.
Authoritative sources
Complete CVE record and remediation plan
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