Stack-based buffer overflow vulnerability in frontend/main.c in faad2 before 2.2.7.1 allow local attackers to execute arbitrary code via fil
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.
- Published
- Feb 26, 2021
- Updated
- Jun 16, 2026
- EPSS
- 1.1% · 65th percentile
- CWE
- CWE-121
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.1%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| synology | diskstation manager | cpe:2.3:o:synology:diskstation_manager |
| synology | vs960hd firmware | cpe:2.3:o:synology:vs960hd_firmware |
| synology | vs960hd | cpe:2.3:h:synology:vs960hd |
| synology | skynas firmware | cpe:2.3:o:synology:skynas_firmware |
| synology | skynas | cpe:2.3:h:synology:skynas |
| synology | diskstation manager unified controller | cpe:2.3:o:synology:diskstation_manager_unified_controller |
| synology | uc3200 | cpe:2.3:h:synology:uc3200 |
| faad2 project | faad2 | cpe:2.3:a:faad2_project:faad2 |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- faad2 project faad2before 2.2.7.1
- synology diskstation managerbefore 6.2.3-25426-3
- synology diskstation manager unified controller3.0
- synology skynas firmwareall versions
- synology vs960hd firmwareall versions
Versions reported by the vendor
Affected version ranges reported by the assigning authority (synology). Independent of NVD's CPE analysis and usually ahead of it.
github/knik0 faad2
- unspecified and later · before 2.2.7.1affected
Same product
synology: all recordsOther highest-scoring records for the same primary product.
- CVE-2013-6955webman/imageSelector.cgi in Synology DiskStation Manager (DSM) 4.0 before 4.0-2259, 4.2 before 4.2-3243, and 4.3 before 4.3-3810 Update 1 al65This week
- CVE-2017-15889Command injection vulnerability in smart.cgi in Synology DiskStation Manager (DSM) before 5.2-5967-5 allows remote authenticated users to ex57Plan
- CVE-2017-9554An information exposure vulnerability in forget_passwd.cgi in Synology DiskStation Manager (DSM) before 6.1.3-15152 allows remote attackers 44Plan
- CVE-2022-22687Buffer copy without checking size of input ('Classic Buffer Overflow') vulnerability in Authentication functionality in Synology DiskStation40Plan
- CVE-2021-27649Use after free vulnerability in file transfer protocol component in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote at40Plan
- CVE-2021-27647Out-of-bounds Read vulnerability in iscsi_snapshot_comm_core in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attack40Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-121 · Stack-based Buffer OverflowCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
- github.com/knik0/faad2/commit/720f7004d6c4aabee19aad16e7c456ed76a3ebfa
- www.synology.com/security/advisory/Synology_SA_20_26
Vendor advisories and official records. Exploit/PoC links are deliberately left out.