Credential compromise via concurrent rate-limit bypass
Published Jun 22, 2023 · Updated Dec 5, 2024
Brute-force protection bypass in Nextcloud Server allows remote attackers to exceed configured failed-request limits through parallel requests. BruteForceMiddleware::afterController delayed responses before registering failed attempts and did not abort at the maximum delay, so concurrent requests checked the same stale counter. No authentication or user interaction is required; the bypass increases guesses accepted per rate-limit window and exposes protected details if a guess succeeds.
Summary
What happened
Brute-force protection bypass in Nextcloud Server allows remote attackers to exceed configured failed-request limits through parallel requests. BruteForceMiddleware::afterController delayed responses before registering failed attempts and did not abort at the maximum delay, so concurrent requests checked the same stale counter. No authentication or user interaction is required; the bypass increases guesses accepted per rate-limit window and exposes protected details if a guess succeeds.
The record
- CVE
- CVE-2023-32320
- Published
- Jun 22, 2023
- Updated
- Dec 5, 2024
- Vendor
- Nextcloud GmbH
- Product
- Security Advisories
- Classifications
- CWE-307, T1110
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 22, 2023CVE publishedPublication date reported by the CVE source.
- Dec 5, 2024Record 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=Nextcloud Enterprise Server >= 21.0.0, < 21.0.9.12
- Affected versionversion=Nextcloud Enterprise Server >= 22.0.0, < 22.2.10.12
- Affected versionversion=Nextcloud Enterprise Server >= 23.0.0, < 23.0.12.7
- Affected versionversion=Nextcloud Enterprise Server >= 24.0.0, < 24.0.12.2
- Affected versionversion=Nextcloud Enterprise Server >= 25.0.0, < 25.0.7
- Affected versionversion=Nextcloud Enterprise Server >= 26.0.0, < 26.0.2
- Affected versionversion=Nextcloud Server >= 25.0.0, < 25.0.7
- Affected versionversion=Nextcloud Server >= 26.0.0, < 26.0.2
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
No public exploit references are available in this record.
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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