CVE-2026-7273

EUVD-2026-37030
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.8 HIGH
ADJACENT_NETWORK
LOW
NONE
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 86.34%
Affected Products (NVD)
VendorProductVersion
zyxelgs1900-8_firmware
𝑥
< 2.90\(aahh.2\)c0
zyxelgs1900-8hp_firmware
𝑥
< 2.90\(aahi.2\)c0
zyxelgs1900-10hp_firmware
𝑥
< 2.90\(aazi.2\)c0
zyxelgs1900-16_firmware
𝑥
< 2.90\(aahj.2\)c0
zyxelgs1900-24_firmware
𝑥
< 2.90\(aahl.2\)c0
zyxelgs1900-24e_firmware
𝑥
< 2.90\(aahk.2\)c0
zyxelgs1900-24ep_firmware
𝑥
< 2.90\(abto.2\)c0
zyxelgs1900-24hpv2_firmware
𝑥
< 2.90\(abtp.2\)c0
zyxelgs1900-48_firmware
𝑥
< 2.90\(aahn.2\)c0
zyxelgs1900-48hpv2_firmware
𝑥
< 2.90\(abtq.2\)c0
𝑥
= Vulnerable software versions
Common Weakness Enumeration
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.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7273
https://www.greynoise.io/blog/open-season-on-kapibala-attacker-steals-government-records-wordpress-exploitation