High severity · published Feb 24, 2026
CVE-2025-13943
A post-authentication command injection vulnerability in the log file download function of the Zyxel EX3301-T0 firmware versions through 5.50(ABVY.7)C0 could allow an…
8.8
CVSS
1.6%
EPSS
No
On KEV
Description
A post-authentication command injection vulnerability in the log file download function of the Zyxel EX3301-T0 firmware versions through 5.50(ABVY.7)C0 could allow an authenticated attacker to execute operating system (OS) commands on an affected device.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.6% · higher than 75% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AF
Am7510-00 Firmware · Zyxel
before 5.63\(acoe.0.1\)c0 · source: NVD
AF
Ax7501-b1 Firmware · Zyxel
before 5.17\(abpc.7.1\)c0 · source: NVD
DF
Dm4200-b0 Firmware · Zyxel
before 5.17\(acbs.1.6\)c0 · source: NVD
DF
Dx3300-t0 Firmware · Zyxel
before 5.50\(abvy.7.1\)c0 · source: NVD
DF
Dx3300-t1 Firmware · Zyxel
before 5.50\(abvy.7.1\)c0 · source: NVD
DF
Dx3301-t0 Firmware · Zyxel
before 5.50\(abvy.7.1\)c0 · source: NVD
DF
Dx4510-b0 Firmware · Zyxel
before 5.17\(abyl.10.1\)c0 · source: NVD
DF
Dx4510-b1 Firmware · Zyxel
before 5.17\(abyl.10.1\)c0 · source: NVD
DF
Dx5401-b1 Firmware · Zyxel
before 5.17\(abyo.7.1\)c0 · source: NVD
EF
Ee3301-00 Firmware · Zyxel
before 5.63\(acmu.2.1\)c0 · source: NVD
EF
Ee5301-00 Firmware · Zyxel
before 5.63\(acld.2.1\)c0 · source: NVD
EF
Ee6510-10 Firmware · Zyxel
before 5.19\(acjq.4.1\)c0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-13943
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-13943
Vendor Advisory
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
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