Live › vulnerability › CVE-2026-7273
Go to dashboardZyxel GS1900 series managed switches have a stack-based buffer overflow in their CGI web program. A LAN-based attacker with no login can send a crafted HTTP request and potentially run OS commands on the switch.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
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.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Zyxel GS1900 Series Switches | vendor | – | – |
| zyxel gs1900-8 firmware | vendor | < 2.90\(aahh.2\)c0 | 2.90\(aahh.2\)c0 |
| zyxel gs1900-8hp firmware | vendor | < 2.90\(aahi.2\)c0 | 2.90\(aahi.2\)c0 |
| zyxel gs1900-10hp firmware | vendor | < 2.90\(aazi.2\)c0 |
| 2.90\(aazi.2\)c0 |
| zyxel gs1900-16 firmware | vendor | < 2.90\(aahj.2\)c0 | 2.90\(aahj.2\)c0 |
| zyxel gs1900-24 firmware | vendor | < 2.90\(aahl.2\)c0 | 2.90\(aahl.2\)c0 |
| zyxel gs1900-24e firmware | vendor | < 2.90\(aahk.2\)c0 | 2.90\(aahk.2\)c0 |
| zyxel gs1900-24ep firmware | vendor | < 2.90\(abto.2\)c0 | 2.90\(abto.2\)c0 |
| zyxel gs1900-24hpv2 firmware | vendor | < 2.90\(abtp.2\)c0 | 2.90\(abtp.2\)c0 |
| zyxel gs1900-48 firmware | vendor | < 2.90\(aahn.2\)c0 | 2.90\(aahn.2\)c0 |
| zyxel gs1900-48hpv2 firmware | vendor | < 2.90\(abtq.2\)c0 | 2.90\(abtq.2\)c0 |
Identify GS1900 switches on the network and check their firmware version against the vendor advisory: unknown Check whether the switch web management interface is reachable from untrusted LAN segments: unknown CISA lists this CVE as known exploited, so treat any unpatched GS1900 as exposed until verified.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
CISA 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.
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