FKIE_CVE-2026-7273

Vulnerability from fkie_nvd - Published: 2026-06-16 03:16 - Updated: 2026-09-22 12:10
Severity
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0 could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request.
References
security@zyxel.com.twhttps://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-stack-based-buffer-overflow-vulnerability-in-gs1900-series-switches-06-16-2026Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7273Third Party Advisory, US Government Resource
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.greynoise.io/blog/open-season-on-kapibala-attacker-steals-government-records-wordpress-exploitationExploit, Third Party Advisory
Impacted products
Vendor Product Version
zyxel gs1900-8_firmware *
zyxel gs1900-8 -
zyxel gs1900-8hp_firmware *
zyxel gs1900-8hp -
zyxel gs1900-10hp_firmware *
zyxel gs1900-10hp -
zyxel gs1900-16_firmware *
zyxel gs1900-16 -
zyxel gs1900-24_firmware *
zyxel gs1900-24 -
zyxel gs1900-24e_firmware *
zyxel gs1900-24e -
zyxel gs1900-24ep_firmware *
zyxel gs1900-24ep -
zyxel gs1900-24hpv2_firmware *
zyxel gs1900-24hpv2 -
zyxel gs1900-48_firmware *
zyxel gs1900-48 -
zyxel gs1900-48hpv2_firmware *
zyxel gs1900-48hpv2 -
To clipboard 

{
  "affected": [
    {
      "affectedData": [
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          "product": "GS1900-48HPv2 firmware",
          "vendor": "Zyxel",
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            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "GS1900-8 firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 2.90(AAHH.1)C0"
            }
          ]
        },
        {
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            {
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              "version": "\u003c= 2.90(AAHI.1)C0"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "GS1900-10HP firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 2.90(AAZI.1)C0"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "GS1900-16 firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 2.90(AAHJ.1)C0"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "GS1900-24 firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 2.90(AAHL.1)C0"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "GS1900-24E firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 2.90(AAHK.1)C0"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "GS1900-24EP firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 2.90(ABTO.1)C0"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "GS1900-24HPv2 firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 2.90(ABTP.1)C0"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "GS1900-48 firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 2.90(AAHN.1)C0"
            }
          ]
        }
      ],
      "source": "security@zyxel.com.tw"
    }
  ],
  "cisaActionDue": "2026-09-24",
  "cisaExploitAdd": "2026-09-21",
  "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset\u0027s internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "cisaVulnerabilityName": "Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability",
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    }
  ],
  "id": "CVE-2026-7273",
  "lastModified": "2026-09-22T12:10:51.067",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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            {
              "technicalImpact": "total"
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          "role": "CISA Coordinator",
          "timestamp": "2026-06-17T00:00:00+00:00",
          "version": "2.0.3"
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  "published": "2026-06-16T03:16:13.557",
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      "tags": [
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      "url": "https://www.greynoise.io/blog/open-season-on-kapibala-attacker-steals-government-records-wordpress-exploitation"
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  "sourceIdentifier": "security@zyxel.com.tw",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
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          "value": "CWE-121"
        }
      ],
      "source": "security@zyxel.com.tw",
      "type": "Secondary"
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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