CVE-2021-4464
Critical
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.
SeverityCritical
CVSS9.3
Exploit probability—
ProductAN5506-04-FA
PublishedNov 12, 2025
First seenNov 12, 2025
Weakness typeCWE-121CWE-121
How to fix
Update
- FiberHome HG6245DRP2602 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| FiberHome AN5506-04-FA | v ≤ RP2631 | — |
| FiberHome HG6245D | v < RP2602 | RP2602 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.