CVE-2021-4464
FIberHome AN5506-04-FA / HG6245D Routers Remote Stack Overflow
- State
- Published
- Severity
- 9.3 Critical
- Published
- Nov 12, 2025
- Updated
- Nov 21, 2025
- Reserved
- Nov 12, 2025
Description
FiberHome AN5506-04-FA firmware versions up to and including RP2631 and HG6245D prior to RP2602 contain a stack-based buffer overflow, as the HTTP service ('webs') fails to enforce maximum lengths for Cookie header values. When a cookie longer than 511 bytes is processed, a stack buffer is overrun, leading to a crash or potential control of execution flow.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
Weaknesses
- CWE-121 Stack-based Buffer Overflow
Affected Products
| Product | Versions |
|---|---|
AN5506-04-FAFiberHome |
|
HG6245DFiberHome |
|
References
- https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#misc-remote-stack-overflow-an5506technical-descriptionexploit
- https://pierrekim.github.io/advisories/2021-fiberhome-0x00-ont.txttechnical-descriptionexploit
- https://www.vulncheck.com/advisories/fiberhome-routers-remote-stack-overflowthird-party-advisory
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