Vulnerability-Lookup

CNVD-2026-23795

Vulnerability from cnvd - Published: 2026-06-09

Title

Zyxel VMG4005-B50B缓冲区溢出漏洞

Description

Zyxel VMG4005-B50B是一款网络设备固件，主要用于管理Zyxel VMG4005-B50B路由器设备的网络功能和配置。 Zyxel VMG4005-B50B存在缓冲区溢出漏洞。该漏洞源于UPnP DeletePortMapping()命令未能正确验证输入数据大小，导致内存破坏。攻击者可利用该漏洞触发临时拒绝服务(DoS)条件，影响设备UPnP功能。

Severity

中

Patch Name

Zyxel VMG4005-B50B缓冲区溢出漏洞的补丁

Patch Description

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerabilities-in-the-upnp-function-of-certain-4g-lte-5g-nr-cpe-and-dsl-ethernet-cpe-06-02-2026

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-3871

Impacted products

Name
ZyXEL VMG4005-B50B firmware <=5.13(ABRL.5.4)C0

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-3871",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-3871"
    }
  },
  "description": "Zyxel VMG4005-B50B\u662f\u4e00\u6b3e\u7f51\u7edc\u8bbe\u5907\u56fa\u4ef6\uff0c\u4e3b\u8981\u7528\u4e8e\u7ba1\u7406Zyxel VMG4005-B50B\u8def\u7531\u5668\u8bbe\u5907\u7684\u7f51\u7edc\u529f\u80fd\u548c\u914d\u7f6e\u3002\n\nZyxel VMG4005-B50B\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8eUPnP DeletePortMapping()\u547d\u4ee4\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1\u8f93\u5165\u6570\u636e\u5927\u5c0f\uff0c\u5bfc\u81f4\u5185\u5b58\u7834\u574f\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u89e6\u53d1\u4e34\u65f6\u62d2\u7edd\u670d\u52a1(DoS)\u6761\u4ef6\uff0c\u5f71\u54cd\u8bbe\u5907UPnP\u529f\u80fd\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerabilities-in-the-upnp-function-of-certain-4g-lte-5g-nr-cpe-and-dsl-ethernet-cpe-06-02-2026",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-23795",
  "openTime": "2026-06-09",
  "patchDescription": "Zyxel VMG4005-B50B\u662f\u4e00\u6b3e\u7f51\u7edc\u8bbe\u5907\u56fa\u4ef6\uff0c\u4e3b\u8981\u7528\u4e8e\u7ba1\u7406Zyxel VMG4005-B50B\u8def\u7531\u5668\u8bbe\u5907\u7684\u7f51\u7edc\u529f\u80fd\u548c\u914d\u7f6e\u3002\r\n\r\nZyxel VMG4005-B50B\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8eUPnP DeletePortMapping()\u547d\u4ee4\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1\u8f93\u5165\u6570\u636e\u5927\u5c0f\uff0c\u5bfc\u81f4\u5185\u5b58\u7834\u574f\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u89e6\u53d1\u4e34\u65f6\u62d2\u7edd\u670d\u52a1(DoS)\u6761\u4ef6\uff0c\u5f71\u54cd\u8bbe\u5907UPnP\u529f\u80fd\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Zyxel VMG4005-B50B\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "ZyXEL VMG4005-B50B firmware \u003c=5.13(ABRL.5.4)C0"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-3871",
  "serverity": "\u4e2d",
  "submitTime": "2026-06-03",
  "title": "Zyxel VMG4005-B50B\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e"
}

CVE-2026-3871 (GCVE-0-2026-3871)

Vulnerability from cvelistv5 – Published: 2026-06-02 02:04 – Updated: 2026-06-02 13:34

Summary

A buffer overflow vulnerability in the UPnP DeletePortMapping() command in Zyxel VMG4005-B50B firmware versions through 5.13(ABRL.5.4)C0 could allow an adjacent attacker to trigger a temporary denial-of-service (DoS) condition affecting the UPnP function of the affected device.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-02 13:33 UTC

CWE

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

Zyxel mitre root

References

1 reference

URL	Tags
https://www.zyxel.com/global/en/support/security-…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Zyxel	VMG4005-B50B firmware	Affected: <= 5.13(ABRL.5.4)C0

Show details on NVD website

JSON

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{
  "containers": {
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        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-3871",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-02T13:33:55.686685Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        "providerMetadata": {
          "dateUpdated": "2026-06-02T13:34:07.547Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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      }
    ],
    "cna": {
      "affected": [
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          "product": "VMG4005-B50B firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 5.13(ABRL.5.4)C0"
            }
          ]
        }
      ],
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              "type": "text/html",
              "value": "A buffer overflow vulnerability in the UPnP DeletePortMapping() command in Zyxel VMG4005-B50B firmware versions through 5.13(ABRL.5.4)C0 could allow an adjacent attacker to trigger a temporary denial-of-service (DoS) condition affecting the UPnP function of the affected device."
            }
          ],
          "value": "A buffer overflow vulnerability in the UPnP DeletePortMapping() command in Zyxel VMG4005-B50B firmware versions through 5.13(ABRL.5.4)C0 could allow an adjacent attacker to trigger a temporary denial-of-service (DoS) condition affecting the UPnP function of the affected device."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-06-02T02:04:17.047Z",
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  "cveMetadata": {
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    "datePublished": "2026-06-02T02:04:17.047Z",
    "dateReserved": "2026-03-10T08:42:18.809Z",
    "dateUpdated": "2026-06-02T13:34:07.547Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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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CNVD-2026-23795

CVE-2026-3871 (GCVE-0-2026-3871)

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