Vulnerability details
CVE-2026-7273
Actively exploited
Zyxel GS1900-10HP firmwareZyxel GS1900-16 firmwareZyxel GS1900-24 firmwareZyxel GS1900-24E firmwareZyxel GS1900-24EP firmwareZyxel GS1900-24HPv2 firmware
CVSS 3.1
8.8High
Official 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.
Related news
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.8High | 3.1 | CVEProject cvelistV5 (CNA) (Zyxel) | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Zyxel | GS1900-10HP firmware | <= 2.90(AAZI.1)C0 | CVEProject cvelistV5 (CNA) |
| Zyxel | GS1900-16 firmware | <= 2.90(AAHJ.1)C0 | CVEProject cvelistV5 (CNA) |
| Zyxel | GS1900-24 firmware | <= 2.90(AAHL.1)C0 | CVEProject cvelistV5 (CNA) |
| Zyxel | GS1900-24E firmware | <= 2.90(AAHK.1)C0 | CVEProject cvelistV5 (CNA) |
| Zyxel | GS1900-24EP firmware | <= 2.90(ABTO.1)C0 | CVEProject cvelistV5 (CNA) |
| Zyxel | GS1900-24HPv2 firmware | <= 2.90(ABTP.1)C0 | CVEProject cvelistV5 (CNA) |
| Zyxel | GS1900-48 firmware | <= 2.90(AAHN.1)C0 | CVEProject cvelistV5 (CNA) |
| Zyxel | GS1900-48HPv2 firmware | <= 2.90(ABTQ.1)C0 | CVEProject cvelistV5 (CNA) |
| Zyxel | GS1900-8 firmware | <= 2.90(AAHH.1)C0 | CVEProject cvelistV5 (CNA) |
| Zyxel | GS1900-8HP firmware | <= 2.90(AAHI.1)C0 | CVEProject cvelistV5 (CNA) |
References and advisories
3- 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
- https://www.greynoise.io/blog/open-season-on-kapibala-attacker-steals-government-records-wordpress-exploitation third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7273 government-resource
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Details
- Published
- 2026-06-16
- Last updated
- 2026-09-22
- State
- Published
- Assigner (CNA)
- Zyxel
- Kolun priority
- 81 · Critical
CISA KEV catalog
- Date added
- 2026-09-21
- Due date
- 2026-09-24
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
2.73%
Probability of exploitation in 30 days
86.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-121Stack-based buffer overflow