Server file read via fastjson type metadata
Published Nov 10, 2025 · Updated Nov 12, 2025
Deserialization in the ktg-mes backend allows remote attackers to read server files through crafted JSON sent to an affected endpoint. GenController.editSave and four stock-taking add or edit handlers pass attacker-controlled nested type metadata to fastjson 1.2.80, enabling attacker-chosen Java object construction. The published demonstrator supplies an administrative bearer token and reads one local byte, although CISA's assessment records no required privileges.
Summary
What happened
Deserialization in the ktg-mes backend allows remote attackers to read server files through crafted JSON sent to an affected endpoint. GenController.editSave and four stock-taking add or edit handlers pass attacker-controlled nested type metadata to fastjson 1.2.80, enabling attacker-chosen Java object construction. The published demonstrator supplies an administrative bearer token and reads one local byte, although CISA's assessment records no required privileges.
The record
- CVE
- CVE-2025-63617
- Published
- Nov 10, 2025
- Updated
- Nov 12, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-502, T1005
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 10, 2025CVE publishedPublication date reported by the CVE source.
- Nov 12, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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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.
Public exploit references
- Single-byte local-file read proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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