CVE-2019-15800

9.8 CRITICAL 4% exploit odds Fix listed Injection Network gear

What it is

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() functions in the libclicmd.so library contained in the firmware, an attacker could leverage these functions to call system() and execute arbitrary commands on the switches. (Note that these functions are currently not called in this version of the firmware, however an attacker could use other vulnerabilities to finally use these vulnerabilities to gain code execution.)

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 3.9% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2019-11-14 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 02:21 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 3.9% in the next 30 days (EPSS).
Severity: 9.8 CRITICAL (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2019-11-14 21:15 UTC
Last modified: 2026-06-17 02:21 UTC
Exploit probability: 3.9% · EPSS, next 30 days
Weakness: CWE-78 · OS command injection
Record status: Modified

Affected

Zyxel gs1900-8 Firmware < 2.50\(aahh.0\)c0
Zyxel gs1900-8hp Firmware < 2.50\(aahi.0\)c0
Zyxel gs1900-10hp Firmware < 2.50\(aazi.0\)c0
Zyxel gs1900-16 Firmware < 2.50\(aahj.0\)c0
Zyxel gs1900-24e Firmware < 2.50\(aahk.0\)c0
Zyxel gs1900-24 Firmware < 2.50\(aahl.0\)c0
Zyxel gs1900-24hp Firmware < 2.50\(aahm.0\)c0
Zyxel gs1900-48 Firmware < 2.50\(aahn.0\)c0

Attack profile CVSS 3.1 · 9.8

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record