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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.

PUBLISHED Reserved 2025-11-12 | Published 2025-11-12 | Updated 2025-11-21 | Assigner VulnCheck




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-121 Stack-based Buffer Overflow

Product status

Default status
unaffected

Any version
affected

Default status
unaffected

Any version before RP2602
affected

Timeline

2021-01-12:Pierre Kim publicly discloses vulnerability.

Credits

Pierre Barre finder

References

pierrekim.github.io/...berhome-ont-0day-vulnerabilities.html technical-description exploit

pierrekim.github.io/advisories/2021-fiberhome-0x00-ont.txt technical-description exploit

www.vulncheck.com/...fiberhome-routers-remote-stack-overflow third-party-advisory

cve.org (CVE-2021-4464)

nvd.nist.gov (CVE-2021-4464)

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