Service interruption via unsigned buffer-space underflow
Published Jun 2, 2025 · Updated Jun 2, 2025
Integer underflow in setDeferredReply in Valkey through 8.1.1 allows remote attackers to interrupt service over an adjacent network. The function subtracts an output buffer's used length from its unsigned size before verifying that the used length is smaller, so the remaining-space test wraps when used exceeds size. Trigger details and the exact form of interruption are undisclosed; exploitation requires adjacent-network access and high complexity.
Summary
What happened
Integer underflow in setDeferredReply in Valkey through 8.1.1 allows remote attackers to interrupt service over an adjacent network. The function subtracts an output buffer's used length from its unsigned size before verifying that the used length is smaller, so the remaining-space test wraps when used exceeds size. Trigger details and the exact form of interruption are undisclosed; exploitation requires adjacent-network access and high complexity.
The record
- CVE
- CVE-2025-49112
- Published
- Jun 2, 2025
- Updated
- Jun 2, 2025
- Vendor
- Valkey
- Product
- Valkey
- Classifications
- CWE-191, T1499
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 2, 2025CVE publishedPublication date reported by the CVE source.
- Jun 2, 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 <=8.1.1
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
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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