CVE-2026-7273

highpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.025 · 85 %ileEURUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV

Likely / severe?

2.50% (85th) EPSS

CVSS 8.8 · high

Is it mine?

30 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · fstec_bdu

added 2026-09-21remediate by 2026-09-24

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.

EPSS · scored 2026-10-23

Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability

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

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.8highAV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · security@zyxel.com.twexploitability 2.8 · impact 5.9

v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-121USCWE-121US

affected products (30)

Products and version ranges known to be affected.

Zyxel GS1900-10HP firmware≤ ≤ 2.90(AAZI.1)C0enisa_euvdEU
Zyxel GS1900-16 firmware≤ ≤ 2.90(AAHJ.1)C0enisa_euvdEU
Zyxel GS1900-24 firmware≤ ≤ 2.90(AAHL.1)C0enisa_euvdEU
Zyxel GS1900-24E firmware≤ ≤ 2.90(AAHK.1)C0enisa_euvdEU
Zyxel GS1900-24EP firmware≤ ≤ 2.90(ABTO.1)C0enisa_euvdEU
Zyxel GS1900-24HPv2 firmware≤ ≤ 2.90(ABTP.1)C0enisa_euvdEU
Zyxel GS1900-48 firmware≤ ≤ 2.90(AAHN.1)C0enisa_euvdEU
Zyxel GS1900-48HPv2 firmware≤ ≤ 2.90(ABTQ.1)C0enisa_euvdEU
Zyxel GS1900-8 Firmware≤ ≤ 2.90(AAHH.1)C0enisa_euvdEU
Zyxel GS1900-8HP firmware≤ ≤ 2.90(AAHI.1)C0enisa_euvdEU
Zyxel Communications Corp. GS1900-10HP≤ 2.90(AAZI.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-16≤ 2.90(AAHJ.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-24≤ 2.90(AAHL.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-24E≤ 2.90(AAHK.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-24EP≤ 2.90(ABTO.1)Cfstec_bduRU
Zyxel Communications Corp. GS1900-24HPv2≤ 2.90(ABTP.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-48≤ 2.90(AAHN.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-48HPv2≤ 2.90(ABTQ.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-8≤ 2.90(AAHH.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-8HP≤ 2.90(AAHI.1)C0fstec_bduRU

showing 20 of 30

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu NVD CVE.org MITRE

published 2026-06-16modified 2026-09-23

references (3)

External citations — patches, advisories, analysis.

scry

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