Vulnerability-Lookup

GHSA-9M65-3XWH-873P

Vulnerability from github – Published: 2025-11-13 00:30 – Updated: 2025-11-13 00:30

Details

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.

Severity

9.3 (Critical)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2021-4464"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-121"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-11-12T22:15:42Z",
    "severity": "CRITICAL"
  },
  "details": "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 (\u0027webs\u0027) 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.",
  "id": "GHSA-9m65-3xwh-873p",
  "modified": "2025-11-13T00:30:17Z",
  "published": "2025-11-13T00:30:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-4464"
    },
    {
      "type": "WEB",
      "url": "https://pierrekim.github.io/advisories/2021-fiberhome-0x00-ont.txt"
    },
    {
      "type": "WEB",
      "url": "https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#misc-remote-stack-overflow-an5506"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/fiberhome-routers-remote-stack-overflow"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2021-4464 (GCVE-0-2021-4464)

Vulnerability from cvelistv5 – Published: 2025-11-12 22:09 – Updated: 2025-11-21 15:36

Title

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

Summary

Severity

9.3 (Critical)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-11-13 14:30 UTC

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

VulnCheck mitre root

References

3 references

URL	Tags
https://pierrekim.github.io/blog/2021-01-12-fiber…	technical-descriptionexploit
https://pierrekim.github.io/advisories/2021-fiber…	technical-descriptionexploit
https://www.vulncheck.com/advisories/fiberhome-ro…	third-party-advisory

Impacted products

2 products

Vendor	Product	Version
FiberHome	AN5506-04-FA	Affected: 0 , ≤ RP2631 (custom) cpe:2.3:o:fiberhome:an5506-04-fa_firmware::::::::
FiberHome	HG6245D	Affected: 0 , < RP2602 (custom) cpe:2.3:o:fiberhome:hg6245d_firmware::::::::

Credits

Pierre Barre

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
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        "metrics": [
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            "other": {
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                "id": "CVE-2021-4464",
                "options": [
                  {
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                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-11-13T14:30:31.859197Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-11-13T14:35:47.050Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "AN5506-04-FA",
          "vendor": "FiberHome",
          "versions": [
            {
              "lessThanOrEqual": "RP2631",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "HG6245D",
          "vendor": "FiberHome",
          "versions": [
            {
              "lessThan": "RP2602",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:fiberhome:an5506-04-fa_firmware:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "0",
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                }
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            }
          ],
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        }
      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
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            "exploitMaturity": "NOT_DEFINED",
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            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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        },
        {
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          "url": "https://www.vulncheck.com/advisories/fiberhome-routers-remote-stack-overflow"
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      "x_generator": {
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    "assignerShortName": "VulnCheck",
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    "datePublished": "2025-11-12T22:09:20.835Z",
    "dateReserved": "2025-11-12T21:24:45.845Z",
    "dateUpdated": "2025-11-21T15:36:02.534Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-9M65-3XWH-873P

CVE-2021-4464 (GCVE-0-2021-4464)

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