Host file disclosure via external entity expansion
Published Feb 21, 2025 · Updated Mar 17, 2025
XXE in the CloudEvents Java SDK 4.0.1 allows attackers to read host files through crafted XML-formatted event messages. The XML deserializer retrieves an attacker-hosted external DTD, expands an entity containing a local file, and sends its value to an attacker-controlled URL. Reachability requires a consuming application to pass untrusted XML to deserialize(); CISA assesses low privileges and user interaction, and the demonstrated consequence is file disclosure.
Summary
What happened
XXE in the CloudEvents Java SDK 4.0.1 allows attackers to read host files through crafted XML-formatted event messages. The XML deserializer retrieves an attacker-hosted external DTD, expands an entity containing a local file, and sends its value to an attacker-controlled URL. Reachability requires a consuming application to pass untrusted XML to deserialize(); CISA assesses low privileges and user interaction, and the demonstrated consequence is file disclosure.
The record
- CVE
- CVE-2024-55156
- Published
- Feb 21, 2025
- Updated
- Mar 17, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-134, T1005
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 21, 2025CVE publishedPublication date reported by the CVE source.
- Mar 17, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
- XXE file-exfiltration proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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