CVE-2019-15800 json
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0.
published 2019-11-14 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-6719
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.9%
- EPSS 3.9% chance of exploitation in 30 days, percentile 90%
- public exploits
- 0
- none known
Summary
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.)
Patch / fix
- 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
- zyxel gs1900-48hp_firmware 2.50\(aaho.0\)c0
Exploit prediction
3.87% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- jasper.la https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 10.0 | AV:N/AC:L/Au:N/C:C/I:C/A:C |
Classification
- Weakness
-
- CWE-78 Improper Neutralization of Special Elements used in an OS Command
References
-
jasper.la
/exploring-zyxel-gs1900-firmware-with-ghidra.html
exploit, third-party-advisory
-
zyxel.com
/support/gs1900-switch-vulnerabilities.shtml
vendor-advisory
Sources
- CVE List CVE-2019-15800
- NVD CVE-2019-15800
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.