OS Command Injection in ZyXEL Communications Corp. products - CVE-2025-13943

Vulnerability identifier: #VU123168

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-13943

CWE-ID: CWE-78

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation in the log file download function. A remote user can pass specially crafted data to the application and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

EX3600-T0
EX3300-T0
PM3100-T0
EX3300-T1
PE5301-01
EX3301-T0
PE3301-00
EX3500-T0
AX7501-B1
EX3501-T0
AM7510-00
EX3510-B1
PM5100-T0
EX5401-B1
VMG4005-B60A
VMG4005-B50A
EX5512-T0
EX5601-T0
GM4100-B0
EX5601-T1
EX7710-B0
EX7501-B0
EX2210-T0
DM4200-B0
DX3300-T0
WX5610-B0
DX3300-T1
WX5600-T0
DX3301-T0
WX3401-B1
WX3100-T0
DX4510-B1
WE4600-00
DX5401-B1
WE3300-00
EE3301-00
PX5301-T0
EE5301-00
PX3321-T1
EE6510-10
PM7500-00
PM5100-T1
EX3510-B0
VMG8623-T50B
VMG4927-B50A
EX5510-B0
VMG3625-T50B
EMG3525-T50B
PM7300-T0
EMG5523-T50B
EMG6726-B10A
DX4510-B0

Install updates from vendor's website.

EX3600-T0 - update to 5.70(ACIF.2.1)C0
EX3300-T0 - update to 5.50(ABVY.7.1)C0
PM3100-T0 - update to 5.42(ACBF.4.2)C0
EX3300-T1 - update to 5.50(ABVY.7.1)C0
PE5301-01 - update to 5.63(ACOJ.2.1)C0
EX3301-T0 - update to 5.50(ABVY.7.1)C0
PE3301-00 - update to 5.63(ACMT.2.1)C0
EX3500-T0 - update to 5.44(ACHR.5.1)C0
AX7501-B1 - update to 5.17(ABPC.7.1)C0
EX3501-T0 - update to 5.44(ACHR.5.1)C0
AM7510-00 - update to 5.63(ACOR.0.1)C0
EX3510-B0 - update to 5.17(ABUP.15.2)C0
VMG8623-T50B - update to 5.50(ABPM.9.7)C0
EX3510-B1 - update to 5.17(ABUP.15.2)C0
PM5100-T0 - update to 5.42(ACBF.4.2)C0
VMG4927-B50A - update to 5.13(ABLY.10.2)C0
EX5401-B1 - update to 5.17(ABYO.7.1)C0
VMG4005-B60A - update to 5.17(ABQA.3.2)C0
EX5510-B0 - update to 5.17(ABQX.11.1)C0
VMG4005-B50A - update to 5.17(ABQA.3.2)C0
EX5512-T0 - update to 5.70(ACEG.5.4)C0
VMG3625-T50B - update to 5.50(ABPM.9.7)C0
EX5601-T0 - update to 5.70(ACDZ.5.1)C0
GM4100-B0 - update to 5.18(ACCL.2)C0
EX5601-T1 - update to 5.70(ACDZ.5.1)C0
EX7710-B0 - update to 5.18(ACAK.1.6)C0
EX7501-B0 - update to 5.18(ACHN.3.1)C0
EX2210-T0 - update to 5.50(ACDI.2.4)C0
DM4200-B0 - update to 5.17(ACBS.1.6)C0
DX3300-T0 - update to 5.50(ABVY.7.1)C0
WX5610-B0 - update to 5.18(ACGJ.0.5)C0
DX3300-T1 - update to 5.50(ABVY.7.1)C0
WX5600-T0 - update to 5.70(ACEB.5.1)C0
DX3301-T0 - update to 5.50(ABVY.7.1)C0
WX3401-B1 - update to 5.17(ABVE.2.10)C0
DX4510-B0 - update to 5.17(ABYL.10.1)C0
WX3100-T0 - update to 5.50(ABVL.4.9)C0
DX4510-B1 - update to 5.17(ABYL.10.1)C0
WE4600-00 - update to 5.63(ACOR.0.1)C0
DX5401-B1 - update to 5.17(ABYO.7.1)C0
WE3300-00 - update to 5.70(ACKA.1.1)C0
EE3301-00 - update to 5.63(ACMU.2.1)C0
PX5301-T0 - update to 5.44(ACKB.0.6)C0
EE5301-00 - update to 5.63(ACLD.2.1)C0
PX3321-T1 - update to 5.44(ACHK.3)C0
EE6510-10 - update to 5.19(ACJQ.4.1)C0
PM7500-00 - update to 5.61(ACKK.1.2)C0
EMG3525-T50B - update to 5.50(ABPM.9.7)C0
PM7300-T0 - update to 5.42(ABYY.4.1)C0
EMG5523-T50B - update to 5.50(ABPM.9.7)C0
PM5100-T1 - update to 5.42(ACBF.4.2)C0
EMG6726-B10A - update to 5.13(ABNP.8.2)C1

• https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-null-pointer-dereference-and-command-injection-vulnerabilities-in-certain-4g-lte-5g-nr-cpe-dsl-ethernet-cpe-fiber-onts-security-routers-and-wireless-extenders-02-24-2026

• OS Command Injection in Zyxel products