Vulnerability 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.
Related Weaknesses (CWE)
References
- https://pierrekim.github.io/advisories/2021-fiberhome-0x00-ont.txt
- https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.h
- https://www.vulncheck.com/advisories/fiberhome-routers-remote-stack-overflow
FAQ
What is CVE-2021-4464?
CVE-2021-4464 is a documented vulnerability. 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...
How severe is CVE-2021-4464?
CVSS scoring is not yet available for CVE-2021-4464. Check NVD for updates.
Is there a patch for CVE-2021-4464?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.