Service interruption via pathological IP-address regex
Published Mar 27, 2025 · Updated Mar 27, 2025
Inefficient regular expression matching in OneBlog 2.3.0 through 2.3.9 allows remote attackers to interrupt service via X-Forwarded-For. RegexUtils.isIp applies its IP-address regular expression to an attacker-controlled X-Forwarded-For value, allowing a crafted IPv6-like string to trigger repeated matching and consume CPU. No authentication or user interaction is required, and the demonstrated consequence is application unresponsiveness from CPU exhaustion rather than data access or modification.
Summary
What happened
Inefficient regular expression matching in OneBlog 2.3.0 through 2.3.9 allows remote attackers to interrupt service via X-Forwarded-For. RegexUtils.isIp applies its IP-address regular expression to an attacker-controlled X-Forwarded-For value, allowing a crafted IPv6-like string to trigger repeated matching and consume CPU. No authentication or user interaction is required, and the demonstrated consequence is application unresponsiveness from CPU exhaustion rather than data access or modification.
The record
- CVE
- CVE-2025-2833
- Published
- Mar 27, 2025
- Updated
- Mar 27, 2025
- Vendor
- OneBlog Project
- Product
- OneBlog
- Classifications
- CWE-1333, CWE-400, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 27, 2025CVE publishedPublication date reported by the CVE source.
- Mar 27, 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=2.3.0
- Affected versionversion=2.3.1
- Affected versionversion=2.3.2
- Affected versionversion=2.3.3
- Affected versionversion=2.3.4
- Affected versionversion=2.3.5
- Affected versionversion=2.3.6
- Affected versionversion=2.3.7
- Affected versionversion=2.3.8
- Affected versionversion=2.3.9
What conditions does exploitation require?
What is affected?
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
- Crafted X-Forwarded-For denial-of-service requestproof of concept · unverified
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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