Administrative access via unlimited login attempts
Published Jan 30, 2026 · Updated Jan 30, 2026
Improper login rate limiting in D-Link DIR-823X 250416 allows remote attackers to gain administrative access through password brute force. The Login component's sub_40AC74 function verifies credentials without adequate rate limiting or anti-brute-force controls, permitting repeated guesses. Exploitation is unauthenticated but requires enough guesses to identify a valid administrator password, and the published assessment rates attack complexity as high.
Summary
What happened
Improper login rate limiting in D-Link DIR-823X 250416 allows remote attackers to gain administrative access through password brute force. The Login component's sub_40AC74 function verifies credentials without adequate rate limiting or anti-brute-force controls, permitting repeated guesses. Exploitation is unauthenticated but requires enough guesses to identify a valid administrator password, and the published assessment rates attack complexity as high.
The record
- CVE
- CVE-2026-1685
- Published
- Jan 30, 2026
- Updated
- Jan 30, 2026
- Vendor
- D-Link
- Product
- DIR-823X
- Classifications
- CWE-799, CWE-307, T1110
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 30, 2026CVE publishedPublication date reported by the CVE source.
- Jan 30, 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=250416
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
- DIR-823X /goform/login command-based brute-force proof of conceptproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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