Memory disclosure via MQTT JSON array type confusion
Published Mar 12, 2024 · Updated Apr 16, 2025
Out-of-bounds read in the MQTT stack of Phoenix Contact CHARX SEC-3xxx 1.5.0 and earlier allows remote attackers to disclose memory. The MQTT handler misinterprets user-supplied JSON-encoded arrays without validating their type, causing reads beyond the intended memory object. Authentication is not required, but memory randomization makes brute-force exploitation unreliable and limits this flaw alone to information disclosure.
Summary
What happened
Out-of-bounds read in the MQTT stack of Phoenix Contact CHARX SEC-3xxx 1.5.0 and earlier allows remote attackers to disclose memory. The MQTT handler misinterprets user-supplied JSON-encoded arrays without validating their type, causing reads beyond the intended memory object. Authentication is not required, but memory randomization makes brute-force exploitation unreliable and limits this flaw alone to information disclosure.
The record
- CVE
- CVE-2024-26000
- Published
- Mar 12, 2024
- Updated
- Apr 16, 2025
- Vendor
- Phoenix Contact
- Product
- CHARX SEC-3100
- Classifications
- CWE-125, T0866
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 12, 2024CVE publishedPublication date reported by the CVE source.
- Apr 16, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=1.5.0
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.
Public exploit references
No public exploit references are available in this record.
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Reported exploitation
- Pwn2Own CHARX SEC-3xxx exploit chainexploit chain
Technologies
Your stack
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Your stack
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