CVE-2021-4464
FIberHome AN5506-04-FA / HG6245D Routers Remote Stack Overflow
Vexday Risk Score
48Attention
SSVC decision (CISA)
Attend
PoC available → attend closely
CVSS 9.3EPSS 1.8%KEV nãoPoC públicaNuclei —Metasploit —Patch —
Lifecycle
12 Nov 2025Published on NVD
Recommendation: Plan a near-term fix — a public PoC already exists.
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.
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
public PoCs found — 2
cve_referencepierrekim.github.io/advisories/2021-fiberhome-0x00-ont.txtunverifiedcve_referencepierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#misc-remote-stack-overflow-an5506unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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