CVE-2026-7273

At a glance

Severity: HIGH 8.8
Exploitation: Known exploited (CISA KEV) · added 2026-09-21
Exploited per ENISA since 2026-09-21
EPSS: EPSS 2.78 % · percentile 86 (2026-10-27)
State: PUBLISHED
Published: 2026-06-16
Updated: 2026-09-22
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.

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)

Weaknesses (CWE)

CWE-121

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\(aahh.2\)c0
cpe:2.3:o:zyxel:gs1900-8hp_firmware:*:*:*:*:*:*:*:* < 2.90\(aahi.2\)c0
cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:* < 2.90\(aazi.2\)c0
cpe:2.3:o:zyxel:gs1900-16_firmware:*:*:*:*:*:*:*:* < 2.90\(aahj.2\)c0
cpe:2.3:o:zyxel:gs1900-24_firmware:*:*:*:*:*:*:*:* < 2.90\(aahl.2\)c0
cpe:2.3:o:zyxel:gs1900-24e_firmware:*:*:*:*:*:*:*:* < 2.90\(aahk.2\)c0
cpe:2.3:o:zyxel:gs1900-24ep_firmware:*:*:*:*:*:*:*:* < 2.90\(abto.2\)c0
cpe:2.3:o:zyxel:gs1900-24hpv2_firmware:*:*:*:*:*:*:*:* < 2.90\(abtp.2\)c0
cpe:2.3:o:zyxel:gs1900-48_firmware:*:*:*:*:*:*:*:* < 2.90\(aahn.2\)c0
cpe: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

References

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