CVE-2021-26567
HIGHCVSS 7.8/10EPSS 1.13%
Last modified
CVE-2021-26567 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 1.13% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Synology | Diskstation Manager | < 6.2.3-25426-3 |
| Synology | Vs960hd Firmware | All versions |
| Synology | Skynas Firmware | All versions |
| Synology | Diskstation Manager Unified Controller | 3.0 |
| Faad2 Project | Faad2 | < 2.2.7.1 |
References
- https://www.synology.com/security/advisory/Synology_SA_20_26Vendor Advisory
- https://www.synology.com/security/advisory/Synology_SA_20_26Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-26567?
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.
How severe is CVE-2021-26567?
CVE-2021-26567 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.13% probability of exploitation in the next 30 days.
How do I fix CVE-2021-26567?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-26567?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST