CVE-2021-4464

FIberHome AN5506-04-FA / HG6245D Routers Remote Stack Overflow

Published: Nov 12, 2025Updated: Nov 14, 2025 Sources: CVE List NVDCWE-121

N/ACVSS

NVD MITRE

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.

No summary for this CVE yet.

Weaknesses

CWE-121

Affected Products

FiberHome

commercial·CNaka fiberhome technologies

AN5506-04-FAEmbedded

Hardware Firmware / network-adapter

HG6245DEmbedded

Hardware Firmware / network-adapter

Exploitability

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details

Is your org exposed to CVE-2021-4464?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique

Privilege Escalation

View detailed technique mapping

References

https://pierrekim.github.io/advisories/2021-fiberhome-0x00-ont.txt

pierrekim.github.io

https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#misc-remote-stack-overflow-an5506

pierrekim.github.io

https://www.vulncheck.com/advisories/fiberhome-routers-remote-stack-overflow

vulncheck.com

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2021-4464 and every CVE in our database. Create a free account — no credit card required.

Create Free Account

Plain-language analysis

Impact assessment and exploitation scenario in plain English

Attack graph visualization

Interactive attack path and kill chain mapping

Exploit details & PoC links

ExploitDB, Metasploit, GitHub PoCs with direct links

Nuclei scanner templates

Ready-to-use vulnerability scanner templates

Full remediation guide

Patch instructions, workarounds, and compliance impact

Interactive AI chat

Ask questions about this vulnerability in natural language

Related vulnerabilities

Semantically similar CVEs and attack patterns

REST API & MCP access

Integrate vulnerability data into your workflows