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8.8

CVE-2026-7273KEVEXPLOITEDPATCHED

zyxel · gs1900-8_firmware

CVE-2026-7273: A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABT

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.

Affected Products

Vendor	Product	Versions
zyxel	gs1900-8_firmware	<= 2.90(ABTQ.1)C0, <= 2.90(AAHH.1)C0, <= 2.90(AAHI.1)C0, <= 2.90(AAZI.1)C0, <= 2.90(AAHJ.1)C0, <= 2.90(AAHL.1)C0, <= 2.90(AAHK.1)C0, <= 2.90(ABTO.1)C0, <= 2.90(ABTP.1)C0, <= 2.90(AAHN.1)C0

Also Affects

Downstream vendors/products affected by this vulnerability

Vendor	Product	Source	Confidence
zyxel	gs1900-24_firmware	cve_cpe	95%
zyxel	gs1900-10hp	cve_cpe	95%
zyxel	gs1900-24e_firmware	cve_cpe	95%
zyxel	gs1900-16	cve_cpe	95%
zyxel	gs1900-24ep_firmware	cve_cpe	95%

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-stack-based-buffer-overflow-vulnerability-in-gs1900-series-switches-06-16-2026(vendor-advisory)

Related News (8 articles)

Tier D

Help Net Security20h ago

Week in review: Gyazo breach exposes 23.6M user data, TASK#STOMP steals documents

→ No new info (linked only)

Tier E

Reddit r/cybersecurity5d ago

CISA just added CVE-2026-7273 affecting Zyxel GS1900 switches to its KEV catalog.

→ No new info (linked only)

Tier D

SecurityWeek5d ago

Recent ZyXEL Switch Vulnerability Exploited by Chinese Hackers

→ No new info (linked only)

Tier D

Help Net Security5d ago

Attacker compromised nearly 1000 Zyxel switches since August (CVE-2026-7273)

→ No new info (linked only)

Tier D

BleepingComputer5d ago

CISA orders feds to patch Zyxel flaw exploited for data theft

→ No new info (linked only)

Tier D

The Hacker News5d ago

Zyxel and Veeam Flaws Under Active Exploitation With Command and SYSTEM Access

→ No new info (linked only)

Tier B

CCCS Canada103d ago

Zyxel security advisory (AV26-603)

→ No new info (linked only)

Tier C

VulDB104d ago

CVE-2026-7273 | Zyxel GS1900-48 up to 2.90(ABTQ.1)C0 HTTP stack-based overflow

→ No new info (linked only)

Discussion (0)

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CVSS 3.18.8 HIGH

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

CISA KEV✅ Yes

Actively exploited✅ Yes

Patch available

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-stack-based-buffer-overflow-vulnerability-in-gs1900-series-switches-06-16-2026

CWECWE-121

PublishedJun 16, 2026

Last enriched104d agov2

Trending Score131🔥

Source articles8

Independent7

Info Completeness9/14

Missing: epss, kev, exploit, iocs, mitre_attack

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HIGHCVE-2026-6374

Hardcoded Credentials in Zyxel WAH7601 Router

Pin to Dashboard

Verification

State: unverified

Confidence: 0%

Vulnerability Timeline

CVE Published

Jun 16, 2026

Added to CISA KEV

Jun 16, 2026

Discovered by ZDM

Jun 16, 2026

Updated: severity, cvssEstimate

Jun 16, 2026

Actively Exploited

Sep 22, 2026

Patch Available

Sep 22, 2026

Version History

v2

Last enriched 104d ago

v2Tier C104d ago

Updated severity to CRITICAL, added new affected products, and corrected CVSS estimate to 9.0.

severitycvssEstimate

via VulDB

v1104d ago

Initial creation