Web-server crash via unchecked host formatting
Published Nov 17, 2025 · Updated Nov 18, 2025
Stack buffer overflow in D-Link DWR-M920 and related router firmware 1.01.07 and 1.1.47 allows remote authenticated users to crash the web server. In DWR-M960, sub_420E40 uses sprintf to copy the request's host parameter into a 256-byte stack buffer without checking its length. The demonstrated request makes the management interface unreachable; the CNA rates low privileges as required, while the reproduction claims no authentication but includes a session cookie.
Summary
What happened
Stack buffer overflow in D-Link DWR-M920 and related router firmware 1.01.07 and 1.1.47 allows remote authenticated users to crash the web server. In DWR-M960, sub_420E40 uses sprintf to copy the request's host parameter into a 256-byte stack buffer without checking its length. The demonstrated request makes the management interface unreachable; the CNA rates low privileges as required, while the reproduction claims no authentication but includes a session cookie.
The record
- CVE
- CVE-2025-13304
- Published
- Nov 17, 2025
- Updated
- Nov 18, 2025
- Vendor
- D-Link
- Product
- DWR-M920
- Classifications
- CWE-119, CWE-120, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 17, 2025CVE publishedPublication date reported by the CVE source.
- Nov 18, 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=1.01.07
- Affected versionversion=1.1.47
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
- DWR-M960 formPingDiagnosticRun oversized-host 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
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