CVE-2021-4464

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

Published Nov 12, 2025 CVSS 4.0 · 9.3 Critical EPSS 2.2% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Fiberhome an5506-04-fa Firmware
Fiberhome hg6245d Firmware
CPEs cpe:2.3:o:fiberhome:an5506-04-fa_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:fiberhome:hg6245d_firmware:*:*:*:*:*:*:*:*
Vendors & Products Fiberhome an5506-04-fa Firmware
Fiberhome hg6245d Firmware
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Fiberhome
Fiberhome an5506-04-fa
Fiberhome hg6245d
Vendors & Products Fiberhome
Fiberhome an5506-04-fa
Fiberhome hg6245d
Type Values Removed Values Added
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.
Title FIberHome AN5506-04-FA / HG6245D Routers Remote Stack Overflow
Weaknesses CWE-121
References
Metrics cvssV4_0

{'score': 9.3, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 21, 2025, 3:36 PM
Reserved
Nov 12, 2025, 9:24 PM
Status
Deferred
Published
Nov 12, 2025, 10:15 PM
Modified
Jun 17, 2026, 4:19 AM