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

Advisories

severity: high
date: November 12, 2025
Affecting: AN5506-04-FA firmware versions <= RP2631
HG6245D firmware versions < RP2602
Other router models and versions are likely affected
CVE: CVE-2021-4464
CWE: CWE-121 Stack-based Buffer Overflow
CVSS: 9.3
CVSS V4 Vector: 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
References: Researcher Disclosure
Researcher Advisory
Credit: Pierre Barre
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.