CISA ADP Vulnrichment

Answer in brief

CVE-2026-7273 records a High severity vulnerability in CISA ADP Vulnrichment. The current sources mark it as known exploited. The current feed maps Zyxel/GS1900-10HP firmware (generic), Zyxel/GS1900-16 firmware (generic), Zyxel/GS1900-24E firmware (generic), Zyxel/GS1900-24EP firmware (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 16, 2026Updated Sep 24, 2026Source checked Sep 21, 2026First seen by HOL Sep 21, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: High
Exploitation: Known exploited
Affected software: 10 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Zyxel/GS1900-10HP firmware (generic), Zyxel/GS1900-16 firmware (generic), Zyxel/GS1900-24E firmware (generic), Zyxel/GS1900-24EP firmware (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Zyxel/GS1900-10HP firmwaregeneric	<= 2.90(AAZI.1)C0	Not reported
Zyxel/GS1900-16 firmwaregeneric	<= 2.90(AAHJ.1)C0	Not reported
Zyxel/GS1900-24E firmwaregeneric	<= 2.90(AAHK.1)C0	Not reported
Zyxel/GS1900-24EP firmwaregeneric	<= 2.90(ABTO.1)C0	Not reported
Zyxel/GS1900-24 firmwaregeneric	<= 2.90(AAHL.1)C0	Not reported
Zyxel/GS1900-24HPv2 firmwaregeneric	<= 2.90(ABTP.1)C0	Not reported
Zyxel/GS1900-48 firmwaregeneric	<= 2.90(AAHN.1)C0	Not reported
Zyxel/GS1900-48HPv2 firmwaregeneric	<= 2.90(ABTQ.1)C0	Not reported
Zyxel/GS1900-8 firmwaregeneric	<= 2.90(AAHH.1)C0	Not reported
Zyxel/GS1900-8HP firmwaregeneric	<= 2.90(AAHI.1)C0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Zyxel/GS1900-10HP firmware, Zyxel/GS1900-16 firmware, Zyxel/GS1900-24E firmware.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jun 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 21, 2026
Added to CISA KEV
Sep 21, 2026
Evidence: source:kev:kev:kev:record

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.