CVE-2026-7273
Zyxel GS1900-48HPv2 firmware
At a glance
- Source
- NVD
- EPSS
- EPSS 2.78 % · percentile 86 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Zyxel
- NVD status
- Analyzed
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.
Weaknesses (CWE)
- CWE-121 — Stack-based Buffer Overflow
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
- https://www.greynoise.io/blog/open-season-on-kapibala-attacker-steals-government-records-wordpress-exploitation
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7273
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | Zyxel |
| CVSS 3.1 | HIGH 8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · security@zyxel.com.tw (Secondary) |
European references
- ENISA EUVD · EUVD-2026-37030
- GCVE · GCVE-0-2026-7273
Affected configurations (NVD CPE)
cpe:2.3:o:zyxel:gs1900-8_firmware:*:*:*:*:*:*:*:*< 2.90\(aahh.2\)c0cpe:2.3:o:zyxel:gs1900-8hp_firmware:*:*:*:*:*:*:*:*< 2.90\(aahi.2\)c0cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:*< 2.90\(aazi.2\)c0cpe:2.3:o:zyxel:gs1900-16_firmware:*:*:*:*:*:*:*:*< 2.90\(aahj.2\)c0cpe:2.3:o:zyxel:gs1900-24_firmware:*:*:*:*:*:*:*:*< 2.90\(aahl.2\)c0cpe:2.3:o:zyxel:gs1900-24e_firmware:*:*:*:*:*:*:*:*< 2.90\(aahk.2\)c0cpe:2.3:o:zyxel:gs1900-24ep_firmware:*:*:*:*:*:*:*:*< 2.90\(abto.2\)c0cpe:2.3:o:zyxel:gs1900-24hpv2_firmware:*:*:*:*:*:*:*:*< 2.90\(abtp.2\)c0cpe:2.3:o:zyxel:gs1900-48_firmware:*:*:*:*:*:*:*:*< 2.90\(aahn.2\)c0cpe:2.3:o:zyxel:gs1900-48hpv2_firmware:*:*:*:*:*:*:*:*< 2.90\(abtq.2\)c0
Affected products
| Product | Versions |
|---|---|
| Zyxel · GS1900-48HPv2 firmware | affected <= 2.90(ABTQ.1)C0 |
| Zyxel · GS1900-8 firmware | affected <= 2.90(AAHH.1)C0 |
| Zyxel · GS1900-8HP firmware | affected <= 2.90(AAHI.1)C0 |
| Zyxel · GS1900-10HP firmware | affected <= 2.90(AAZI.1)C0 |
| Zyxel · GS1900-16 firmware | affected <= 2.90(AAHJ.1)C0 |
| Zyxel · GS1900-24 firmware | affected <= 2.90(AAHL.1)C0 |
| Zyxel · GS1900-24E firmware | affected <= 2.90(AAHK.1)C0 |
| Zyxel · GS1900-24EP firmware | affected <= 2.90(ABTO.1)C0 |
| Zyxel · GS1900-24HPv2 firmware | affected <= 2.90(ABTP.1)C0 |
| Zyxel · GS1900-48 firmware | affected <= 2.90(AAHN.1)C0 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| CISA Known Exploited Vulnerabilities | CC0 1.0 |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |