CVE-2021-4464
FIberHome AN5506-04-FA / HG6245D Routers Remote Stack Overflow
CRITICAL 9.3EPSS 2.2%
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.
- Affected
- FiberHome · AN5506-04-FA · HG6245D
- CVSS v4.0 VULNCHECK
- 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS
- 2.18% chance of exploitation in the next 30 days, 82nd percentile
- Published
- 2025-11-12
- Updated
- 2025-11-21
Proof-of-concept exploits (2)
- https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#misc-…
- https://pierrekim.github.io/advisories/2021-fiberhome-0x00-ont.txt