Zyxel ATP/USG FLEX/USG FLEX 50/USG20 -VPN String os command injection

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.2$5k-$25k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Zyxel ATP, USG FLEX, USG FLEX 50 and USG20 -VPN. This impacts an unknown function of the component String Handler. This manipulation causes os command injection. This vulnerability is tracked as CVE-2025-8078. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Zyxel ATP, USG FLEX, USG FLEX 50 and USG20 -VPN (affected version not known) and classified as critical. Affected by this vulnerability is some unknown functionality of the component String Handler. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A post-authentication command injection vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.40, USG FLEX series firmware versions from V4.50 through V5.40, USG FLEX 50(W) series firmware versions from V4.16 through V5.40, and USG20(W)-VPN series firmware versions from V4.16 through V5.40 could allow an authenticated attacker with administrator privileges to execute operating system (OS) commands on the affected device by passing a crafted string as an argument to a CLI command.

It is possible to read the advisory at zyxel.com. This vulnerability is known as CVE-2025-8078 since 07/23/2025. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are required for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/22/2025). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202510-2789) and EUVD (EUVD-2025-35120). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.2
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.2
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.2
CNA Vector (Zyxel): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Os command injection
CWE: CWE-78 / CWE-77 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

07/23/2025 CVE reserved
10/21/2025 +90 days Advisory disclosed
10/21/2025 +0 days VulDB entry created
10/22/2025 +1 days VulDB entry last update

Sourcesinfo

Vendor: zyxel.com

Advisory: zyxel.com
Status: Confirmed

CVE: CVE-2025-8078 (🔒)
GCVE (CVE): GCVE-0-2025-8078
GCVE (VulDB): GCVE-100-329107
EUVD: 🔒
CNNVD: CNNVD-202510-2789 - Zyxel ATP series firmware和Zyxel USG FLEX series firmware 操作系统命令注入漏洞

Entryinfo

Created: 10/21/2025 08:19
Updated: 10/22/2025 19:42
Changes: 10/21/2025 08:19 (62), 10/22/2025 10:50 (1), 10/22/2025 19:42 (6)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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