Vulnerability-Lookup

CNVD-2026-21210

Vulnerability from cnvd - Published: 2026-05-21

Title

Zyxel VMG8825-T50K缓冲区溢出漏洞（CNVD-2026-21210）

Description

Zyxel VMG8825-T50K是中国合勤（Zyxel）公司的一款互联网接入设备。 Zyxel VMG8825-T50K V5.50(ABOM.5)C0之前版本存在缓冲区溢出漏洞，该漏洞源于应用在处理不受信任的输入时出现边界错误，攻击者可利用该漏洞导致拒绝服务或执行任意代码。

Severity

高

Patch Name

Zyxel VMG8825-T50K缓冲区溢出漏洞（CNVD-2026-21210）的补丁

Patch Description

Zyxel VMG8825-T50K是中国合勤（Zyxel）公司的一款互联网接入设备。 Zyxel VMG8825-T50K V5.50(ABOM.5)C0之前版本存在缓冲区溢出漏洞，该漏洞源于应用在处理不受信任的输入时出现边界错误，攻击者可利用该漏洞导致拒绝服务或执行任意代码。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

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/service-provider/global/en/zyxel-security-advisory-remote-code-execution-and-denial-service-vulnerabilities-cpe

Reference

https://nvd.nist.gov/vuln/detail/CVE-2025-7673

Impacted products

Name
ZyXEL vmg8825-t50k <V5.50(ABOM.5)C0

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2025-7673",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2025-7673"
    }
  },
  "description": "Zyxel VMG8825-T50K\u662f\u4e2d\u56fd\u5408\u52e4\uff08Zyxel\uff09\u516c\u53f8\u7684\u4e00\u6b3e\u4e92\u8054\u7f51\u63a5\u5165\u8bbe\u5907\u3002\n\nZyxel VMG8825-T50K V5.50(ABOM.5)C0\u4e4b\u524d\u7248\u672c\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5e94\u7528\u5728\u5904\u7406\u4e0d\u53d7\u4fe1\u4efb\u7684\u8f93\u5165\u65f6\u51fa\u73b0\u8fb9\u754c\u9519\u8bef\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u6216\u6267\u884c\u4efb\u610f\u4ee3\u7801\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/service-provider/global/en/zyxel-security-advisory-remote-code-execution-and-denial-service-vulnerabilities-cpe",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-21210",
  "openTime": "2026-05-21",
  "patchDescription": "Zyxel VMG8825-T50K\u662f\u4e2d\u56fd\u5408\u52e4\uff08Zyxel\uff09\u516c\u53f8\u7684\u4e00\u6b3e\u4e92\u8054\u7f51\u63a5\u5165\u8bbe\u5907\u3002\r\n\r\nZyxel VMG8825-T50K V5.50(ABOM.5)C0\u4e4b\u524d\u7248\u672c\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5e94\u7528\u5728\u5904\u7406\u4e0d\u53d7\u4fe1\u4efb\u7684\u8f93\u5165\u65f6\u51fa\u73b0\u8fb9\u754c\u9519\u8bef\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u6216\u6267\u884c\u4efb\u610f\u4ee3\u7801\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 VMG8825-T50K\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-21210\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "ZyXEL vmg8825-t50k \u003cV5.50(ABOM.5)C0"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2025-7673",
  "serverity": "\u9ad8",
  "submitTime": "2025-07-25",
  "title": "Zyxel VMG8825-T50K\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-21210\uff09"
}

CVE-2025-7673 (GCVE-0-2025-7673)

Vulnerability from cvelistv5 – Published: 2025-07-16 07:11 – Updated: 2026-02-26 17:50

Summary

A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware versions prior to V5.50(ABOM.5)C0 could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and potentially execute arbitrary code by sending a specially crafted HTTP request.

Severity

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-07-19 03:55 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/service-provider/global/en/…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Zyxel	VMG8825-T50K firmware	Affected: < V5.50(ABOM.5)C0

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-7673",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-07-19T03:55:19.719457Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-26T17:50:32.365Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "VMG8825-T50K firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c V5.50(ABOM.5)C0"
            }
          ]
        }
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              "type": "text/html",
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            }
          ],
          "value": "A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware versions prior to V5.50(ABOM.5)C0 could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and potentially execute arbitrary code by sending a specially crafted HTTP request."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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              "type": "CWE"
            }
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      "providerMetadata": {
        "dateUpdated": "2025-07-16T07:11:02.974Z",
        "orgId": "96e50032-ad0d-4058-a115-4d2c13821f9f",
        "shortName": "Zyxel"
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          "url": "https://www.zyxel.com/service-provider/global/en/zyxel-security-advisory-remote-code-execution-and-denial-service-vulnerabilities-cpe"
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  "cveMetadata": {
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    "datePublished": "2025-07-16T07:11:02.974Z",
    "dateReserved": "2025-07-15T02:01:55.637Z",
    "dateUpdated": "2026-02-26T17:50:32.365Z",
    "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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Action not permitted

CNVD-2026-21210

CVE-2025-7673 (GCVE-0-2025-7673)

Tags

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Nomenclature

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