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Vulnerability record · CVE-2021-26567 · published 26 February 2021

CVE-2021-26567: Synology diskstation manager stack-based buffer overflow vulnerability

Synology · Diskstation Manager

Stack-based buffer overflow vulnerability in frontend/main.c in faad2 before 2.2.7.1 allow local attackers to execute arbitrary code via filename and pathname options.

7.8 CVSS 3.1 High EPSS 1.1% · top 34.8% CWE-121 · Stack-based buffer overflowCWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score, v2 6.5
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Stack-based buffer overflow vulnerability in frontend/main.c in faad2 before 2.2.7.1 allow local attackers to execute arbitrary code via filename and pathname options.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/knik0/faad2/commit/720f7004d6c4aabee19aad16e7c456ed76a3ebfa Patch
https://www.synology.com/security/advisory/Synology_SA_20_26 Vendor Advisory
https://github.com/knik0/faad2/commit/720f7004d6c4aabee19aad16e7c456ed76a3ebfa Patch
https://www.synology.com/security/advisory/Synology_SA_20_26 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-26567), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.