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CVE-2026-7273

Stack-based Buffer Overflow

CVSS 3.1 High 8.8Known exploited (CISA KEV)

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

Description

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.

Official description from the CVE record, published by Zyxel. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 3.1 High 8.8
Score published by Zyxel in the CVE record.

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

  • Attack vector: Adjacent

    The attacker needs to be on the same shared network segment or a closely related one.

  • Attack complexity: Low

    No special conditions are needed. The attack can be repeated at will.

  • Privileges required: None

    No account or privileges are needed.

  • User interaction: None

    No action from any user is needed.

  • Scope: Unchanged

    The impact stays within the vulnerable component.

  • Confidentiality impact: High

    Serious or total effect on the secrecy of data.

  • Integrity impact: High

    Serious or total effect on the trustworthiness of data.

  • Availability impact: High

    Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS
Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.02734 (2.7% probability)
Percentile
86.2%
Scores of
Nov 10, 2026
Model
v2026.06.15
CISA Known Exploited Vulnerabilities
This CVE is listed in the CISA KEV catalog.
Name in the catalog
Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability
Added to the catalog
Sep 21, 2026
Federal due date
Sep 24, 2026
CISA assessment as of Jun 17, 2026
Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
no
Technical impact
total
Weakness (CWE)
CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.
Affected products
Products listed in the CVE record, as the CNA published them.

  • Zyxel GS1900-48HPv2 firmware

    • affected: <= 2.90(ABTQ.1)C0

  • Zyxel GS1900-8 firmware

    • affected: <= 2.90(AAHH.1)C0

  • Zyxel GS1900-8HP firmware

    • affected: <= 2.90(AAHI.1)C0

  • Zyxel GS1900-10HP firmware

    • affected: <= 2.90(AAZI.1)C0

  • Zyxel GS1900-16 firmware

    • affected: <= 2.90(AAHJ.1)C0

  • Zyxel GS1900-24 firmware

    • affected: <= 2.90(AAHL.1)C0

  • Zyxel GS1900-24E firmware

    • affected: <= 2.90(AAHK.1)C0

  • Zyxel GS1900-24EP firmware

    • affected: <= 2.90(ABTO.1)C0

  • Zyxel GS1900-24HPv2 firmware

    • affected: <= 2.90(ABTP.1)C0

  • Zyxel GS1900-48 firmware

    • affected: <= 2.90(AAHN.1)C0
References
Links listed in the CVE record. They lead to other sites, which CubePath does not control.
Timeline
  1. ID reserved
  2. Record published
  3. Added to CISA KEV
  4. Record last updated

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:06 UTC. Sources and licenses