CVE-2021-4464
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-12

Last updated on: 2025-11-12

Assigner: VulnCheck

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.
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Meta Information
Published
2025-11-12
Last Modified
2025-11-12
Generated
2026-06-16
AI Q&A
2025-11-13
EPSS Evaluated
2026-06-14
NVD
CVE-2021-4464
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
fiberhome an5506-04-fa rp2602
fiberhome an5506-04-fa rp2631
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
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Executive Summary

This vulnerability is a stack-based buffer overflow in the FiberHome AN5506-04-FA firmware's HTTP service ('webs'). It occurs because the service does not enforce a maximum length for Cookie header values. When a cookie longer than 511 bytes is processed, it overruns the stack buffer, which can cause the device to crash or potentially allow an attacker to control the execution flow.

Impact Analysis

The vulnerability can lead to a crash of the device or potentially allow an attacker to execute arbitrary code by controlling the execution flow. This could result in denial of service or unauthorized control over the affected device.

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