Credential disclosure via cleartext HTTP login
Published Apr 14, 2022 · Updated Apr 15, 2025
Cleartext credential transmission in Moxa MXview Series 3.2.4 and earlier allows attackers to read login credentials by sniffing HTTP traffic. The default web configuration sends JSON username and password fields in an unencrypted POST request to /login instead of protecting the channel with TLS. The attacker must observe network traffic while an administrator logs in over enabled HTTP; disclosure is limited to credentials carried in that session.
Summary
What happened
Cleartext credential transmission in Moxa MXview Series 3.2.4 and earlier allows attackers to read login credentials by sniffing HTTP traffic. The default web configuration sends JSON username and password fields in an unencrypted POST request to /login instead of protecting the channel with TLS. The attacker must observe network traffic while an administrator logs in over enabled HTTP; disclosure is limited to credentials carried in that session.
The record
- CVE
- CVE-2021-40392
- Published
- Apr 14, 2022
- Updated
- Apr 15, 2025
- Vendor
- Moxa
- Product
- MXview Series
- Classifications
- CWE-319, T1040
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 14, 2022CVE publishedPublication date reported by the CVE source.
- Apr 15, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=3.2.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Cisco Talos HTTP login proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo