CVE-2021-31439
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Synology DiskStation Manager.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.33%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Synology DiskStation Manager. Authentication is not required to exploit this vulnerablity. The specific flaw exists within the processing of DSI structures in Netatalk. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-12326.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.33% probability · 83th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-122, CWE-787
- Affected
- synology/diskstation manager · debian/debian linux · netatalk/netatalk
- Source
- zdi-disclosures@trendmicro.com
EPSS 2.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://lists.debian.org/debian-lts-announce/2023/05/msg00018.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202311-02Issue Tracking, Third Party Advisory
- https://www.debian.org/security/2023/dsa-5503Third Party Advisory
- https://www.synology.com/zh-hk/security/advisory/Synology_SA_20_26Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-492/Third Party Advisory, VDB Entry
- https://lists.debian.org/debian-lts-announce/2023/05/msg00018.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202311-02Issue Tracking, Third Party Advisory
- https://www.debian.org/security/2023/dsa-5503Third Party Advisory
- https://www.synology.com/zh-hk/security/advisory/Synology_SA_20_26Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-492/Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.