Service interruption via oversized file-transfer parameters
Published Mar 18, 2026 · Updated Mar 18, 2026
Stack-based buffer overflow in Phoenix Contact FL switches before 3.53 allows remote authenticated users to interrupt service via a POST request. The file-transfer parameter workflow copies oversized POST parameters into a fixed-size stack buffer in an internal process, corrupting memory. High-privileged web-management access is required, and exploitation causes a denial-of-service interruption without reported data disclosure or modification.
Summary
What happened
Stack-based buffer overflow in Phoenix Contact FL switches before 3.53 allows remote authenticated users to interrupt service via a POST request. The file-transfer parameter workflow copies oversized POST parameters into a fixed-size stack buffer in an internal process, corrupting memory. High-privileged web-management access is required, and exploitation causes a denial-of-service interruption without reported data disclosure or modification.
The record
- CVE
- CVE-2026-22318
- Published
- Mar 18, 2026
- Updated
- Mar 18, 2026
- Vendor
- Phoenix Contact
- Product
- FL SWITCH 2204-2TC-2SFX
- Classifications
- CWE-121, T1499
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Mar 18, 2026CVE publishedPublication date reported by the CVE source.
- Mar 18, 2026Record 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=0.0.0 <3.53
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
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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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