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Fencer Intel
critical 9.8

CVE-2019-15800 json

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0.

published 6y ago modified 4mo 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

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Exploit prediction

3.87% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-09).

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

Sources

Fencer Intel 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.