CVE-2021-26561 Memory corruption in Synology DiskStation Manager (DSM)
Man-in-the-middle attackers can execute arbitrary code via a stack-based buffer overflow in the synoagentregisterd service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-26561?
CVE-2021-26561 is a critical memory corruption vulnerability in Synology Diskstation Manager, published on 26 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2021-26561?
It affects 4 products.
Products include Synology Diskstation Manager, Synology Diskstation Manager Unified Controller, Synology Skynas Firmware, Synology Vs960hd Firmware.
How do I fix CVE-2021-26561?
No fix has been published for CVE-2021-26561 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-26561 being exploited?
There is no known exploitation of CVE-2021-26561 in the wild and no public exploit code.
Other vulnerabilities in Synology Diskstation Manager
Sources
Also known as GHSA-4pfw-794r-7wqp.