Stack-based buffer overflow in github/knik0 faad2
Priority LOW 36CWE-121Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.01129 66th percentileScored 2026-11-07
Fix Fixed faad2 (github/knik0): 2.2.7.1
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| github/knik0 | faad2 | before 2.2.7.1 | 2.2.7.1 | Patch available | CNA |
- faad2 Vendorgithub/knik0 Affected before 2.2.7.1 Fixed in 2.2.7.1 Patch available CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:synology:diskstation_manager:*:*:*:*:*:*:*:* | before 6.2.3-25426-3 | Vulnerable | Synology |
| cpe:2.3:o:synology:vs960hd_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Synology |
| cpe:2.3:h:synology:vs960hd:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Synology |
| cpe:2.3:o:synology:skynas_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Synology |
| cpe:2.3:h:synology:skynas:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Synology |
| cpe:2.3:o:synology:diskstation_manager_unified_controller:3.0:*:*:*:*:*:*:* | 3.0 | Vulnerable | Synology |
| cpe:2.3:h:synology:uc3200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Synology |
| cpe:2.3:a:faad2_project:faad2:*:*:*:*:*:*:*:* | before 2.2.7.1 | Vulnerable | Faad2 Project |
- cpe:2.3:o:synology:diskstation_manager:*:*:*:*:*:*:*:* Versions before 6.2.3-25426-3 Vulnerable ·Synology
- cpe:2.3:o:synology:vs960hd_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Synology
- cpe:2.3:h:synology:vs960hd:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Synology
- cpe:2.3:o:synology:skynas_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Synology
- cpe:2.3:h:synology:skynas:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Synology
- cpe:2.3:o:synology:diskstation_manager_unified_controller:3.0:*:*:*:*:*:*:* Versions 3.0 Vulnerable ·Synology
- cpe:2.3:h:synology:uc3200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Synology
- cpe:2.3:a:faad2_project:faad2:*:*:*:*:*:*:*:* Versions before 2.2.7.1 Vulnerable ·Faad2 Project
Remediation
- Fix · CNA faad2 (github/knik0) Fixed in 2.2.7.1
Timeline
- 2026-10-02 Threatist record created from CVE-2021-26567
- 2026-10-03 Alias added: GHSA-f4px-mf48-4h8c
References
Sources
- CVE-2021-26567 · CVE Program
- CVE-2021-26567 · NVD
- FIRST EPSS
- GHSA-f4px-mf48-4h8c · GitHub Advisory Database · CC BY 4.0
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