Zyxel GS1900-48 Firmware vulnerabilities

16 CVEs affecting Zyxel GS1900-48 Firmware, 1 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-7273, published 2026-06-16.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

CVE-2026-7273: Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability, published 2026-06-16. High severity, CVSS 8.8. Actively exploited: in CISA KEV since 2026-09-21. EPSS: 2.5% chance of exploitation in the next 30 days. 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…
CVE-2019-15800, published 2019-11-14. Critical severity, CVSS 9.8. EPSS: 3.9% chance of exploitation in the next 30 days. An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. Due to lack of input validation in the cmd_sys_traceroute_exec(), cmd_sys_arp_clear(), and cmd_sys_ping_exec()…
CVE-2019-15799, published 2019-11-14. High severity, CVSS 8.8. EPSS: 2.3% chance of exploitation in the next 30 days. An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. User accounts created through the web interface of the device, when given non-admin level privileges, have the…
CVE-2019-15802, published 2019-11-14. Medium severity, CVSS 5.9. EPSS: 1.5% chance of exploitation in the next 30 days. An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware hashes and encrypts passwords using a hardcoded cryptographic key in sal_util_str_encrypt() in…
CVE-2019-15801, published 2019-11-14. High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days. An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a…
CVE-2019-15803, published 2019-11-14. Critical severity, CVSS 9.1. EPSS: 1.3% chance of exploitation in the next 30 days. An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. Through an undocumented sequence of keypresses, undocumented functionality is triggered. A diagnostics shell is…
CVE-2019-15804, published 2019-11-14. High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days. An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. By sending a signal to the CLI process, undocumented functionality is triggered. Specifically, a menu can be…
CVE-2024-8881, published 2024-11-12. Medium severity, CVSS 6.8. EPSS: 0.7% chance of exploitation in the next 30 days. A post-authentication command injection vulnerability in the CGI program in the Zyxel GS1900-48 switch firmware version V2.80(AAHN.1)C0 and earlier could allow an authenticated, LAN-based attacker…
CVE-2021-35031, published 2021-12-28. High severity, CVSS 8.0. EPSS: 0.5% chance of exploitation in the next 30 days. A vulnerability in the TFTP client of Zyxel GS1900 series firmware, XGS1210 series firmware, and XGS1250 series firmware, which could allow an authenticated LAN user to execute arbitrary OS commands…
CVE-2022-34746, published 2022-09-20. Medium severity, CVSS 5.9. EPSS: 0.4% chance of exploitation in the next 30 days. An insufficient entropy vulnerability caused by the improper use of randomness sources with low entropy for RSA key pair generation was found in Zyxel GS1900 series firmware versions prior to V2.70.…

Latest

CVE-2024-8882, published 2024-11-12. Medium severity, CVSS 4.5. EPSS: 0.2% chance of exploitation in the next 30 days. A buffer overflow vulnerability in the CGI program in the Zyxel GS1900-48 switch firmware version V2.80(AAHN.1)C0 and earlier could allow an authenticated, LAN-based attacker with administrator…
CVE-2024-38270, published 2024-09-10. Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days. An insufficient entropy vulnerability caused by the improper use of a randomness function with low entropy for web authentication tokens generation exists in the Zyxel GS1900-10HP firmware version…
CVE-2023-35140, published 2023-11-07. Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days. The improper privilege management vulnerability in the Zyxel GS1900-24EP switch firmware version V2.70(ABTO.5) could allow an authenticated local user with read-only access to modify system settings…
CVE-2022-45853, published 2023-05-30. Medium severity, CVSS 6.7. EPSS: 0.2% chance of exploitation in the next 30 days. The privilege escalation vulnerability in the Zyxel GS1900-8 firmware version V2.70(AAHH.3) and the GS1900-8HP firmware version V2.70(AAHI.3) could allow an authenticated, local attacker with…
CVE-2021-35032, published 2021-12-28. High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days. A vulnerability in the 'libsal.so' of the Zyxel GS1900 series firmware version 2.60 could allow an authenticated local user to execute arbitrary OS commands via a crafted function call.
CVE-2021-35030, published 2021-07-26. Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days. A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly sterilize packet contents and could allow an authenticated, local user to perform a…