Authenticated router crash via oversized FTP ABOR argument
Published Nov 14, 2025 · Updated Nov 14, 2025
Buffer overflow in the embedded FTP service of Netis DL4322D firmware RTK 2.1.1 allows remote authenticated users to crash the router. The FTP command parser copies a 1,461-byte argument supplied to a valid command such as ABOR without enforcing the destination buffer's size. FTP credentials and network reachability to port 21 are required; the resulting service failure leaves the device unresponsive and interrupts connectivity for attached users.
Summary
What happened
Buffer overflow in the embedded FTP service of Netis DL4322D firmware RTK 2.1.1 allows remote authenticated users to crash the router. The FTP command parser copies a 1,461-byte argument supplied to a valid command such as ABOR without enforcing the destination buffer's size. FTP credentials and network reachability to port 21 are required; the resulting service failure leaves the device unresponsive and interrupts connectivity for attached users.
The record
- CVE
- CVE-2018-25125
- Published
- Nov 14, 2025
- Updated
- Nov 14, 2025
- Vendor
- Netis Systems Co., Ltd.
- Product
- DL4322D
- Classifications
- CWE-120, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 14, 2025CVE publishedPublication date reported by the CVE source.
- Nov 14, 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 <=RTK 2.1.1
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
- Netis ADSL Router DL4322D RTK 2.1.1 Denial of Service PoCproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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