Critical severityNVD Advisory· Published Nov 12, 2025· Updated Apr 15, 2026

CVE-2021-4464

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.

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

pierrekim.github.io/advisories/2021-fiberhome-0x00-ont.txtnvd
pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.htmlnvd
www.vulncheck.com/advisories/fiberhome-routers-remote-stack-overflownvd

News mentions

No linked articles in our index yet.

cvss	0.585
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000