CVE-2026-7273
Exploitation confirmed. First attested on 2026-09-21 by CISA-ADP, CISA KEV, GCVE · previdian.
- Published2026-06-16
- Fixed in2.90\(aazi.2\)c0
- WeaknessCWE-121
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTCObserved activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-7273?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-7273?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.90 | < 2.90\(aazi.2\)c0 | 2.90\(aazi.2\)c0 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.90 | < 2.90\(aahj.2\)c0 | 2.90\(aahj.2\)c0 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.90 | < 2.90\(aahl.2\)c0 | 2.90\(aahl.2\)c0 | NVD |
7 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Zyxel gs1900-10hp firmware to 2.90\(aazi.2\)c0
- CISA’s 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 2026-09-24
Advisories and patches
- www.zyxel.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
CISA Known Exploited Vulnerability
- Date Added
- 2026-09-21
- Patch Due Date
- 2026-09-24
- Ransomware Use
- Unknown
- 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.
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2026-06-16
- Last Modified
- 2026-09-22
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2026-7273?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.