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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Fiberhome/AN5506-04-FAllm-create
Range: <= RP2631
Fiberhome/HG6245Dllm-create
Range: < RP2602

Patches

Vulnerability mechanics

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

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