CVE-2026-7273
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National Vulnerability Database Information
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.
CVSS Base Score: 8.8 (v3.1)
The CVSS Base Score is a score from 0 to 10 that represents the intrinsic severity of a vulnerability. A higher score indicates greater severity.
0.02.55.07.510.0
Published on: 06/16/2026 03:16:13
Last modified: 10/25/2026 23:10:00
NIST: CVE source from the National Vulnerability Database (NVD)
CVSS Metrics Details
- Base Severity: HIGH
- Attack Vector: ADJACENT_NETWORK
- Attack Complexity: LOW
- Privileges Required: NONE
- User Interaction: NONE
- Scope: UNCHANGED
- Confidentiality Impact: HIGH
- Integrity Impact: HIGH
- Availability Impact: HIGH
Common Weakness Enumeration (CWE)
Database CWE: v4.18
CWE-121: Stack-based Buffer Overflow ↗
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
Fonte: MITRE CWE
FIRST Information
EPSS Score: 0.0273
The EPSS (Exploit Prediction Scoring System) is a score from 0 to 1 that indicates the probability that a vulnerability will be exploited in the real world in the next 30 days. A higher value indicates a greater likelihood of exploitation.
0.00.250.50.751.0
Percentile: 0.8623
The Percentile indicates how much higher this vulnerability's EPSS score is compared to all other vulnerabilities in the EPSS database. For example, a percentile of 0.90 (90%) means that 90% of vulnerabilities have an EPSS score equal to or lower than the current one.
0.00.250.50.751.0
*Data updated as of: 2026-11-10
CISA Information (Known Exploited Vulnerabilities)
The CISA KEV Catalog lists vulnerabilities that have been actively exploited in the real world. If a CVE is present in this catalog, it indicates that the threat is immediate and mitigation should be a top priority.
CVE CVE-2026-7273 IS PRESENT in the CISA KEV Catalog!
- Vulnerability Name: Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability
- Short Description: Zyxel GS1900 series switches contain a stack-based buffer overflow vulnerability in the CGI program which could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request.
- Date Added to KEV: 09/21/2026
- Vendor/Product: Zyxel / GS1900 Series Switches
- Required Action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (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's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- Due Date: 09/24/2026
Articles published on Red Hot Cyber
No articles present on Red Hot Cyber.
Exploit PoC from GitHub
No results found on GitHub for this CVE.
