CVE-2024-6863 json
Encryption of Arbitrary Files with Attacker-Controlled Key in h2oai/h2o-3
published last yr. modified 4mo ago also GHSA-m37h-8r48-2cxj , PYSEC-2026-1442 , EUVD-2025-6964
- cvss
- 6.5
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
Summary
In h2oai/h2o-3 version 3.46.0, an endpoint exposing a custom EncryptionTool allows an attacker to encrypt any files on the target server with a key of their choosing. The chosen key can also be overwritten, resulting in ransomware-like behavior. This vulnerability makes it possible for an attacker to encrypt arbitrary files with keys of their choice, making it exceedingly difficult for the target to recover the keys needed for decryption.
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Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- last yr.
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-11).
Exploits and checks
- huntr.com https://huntr.com/bounties/10f55937-0cba-4530-897f-2abf30ed5270 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 6.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
| GitHub | 3.0 | 6.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
| OSV | 3.0 | 6.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | h2o | >=3.32.1.2, <=3.46.0 |
no fix listed |
| maven | ai.h2o:h2o-core | >=3.32.1.2, <=3.46.0 |
no fix listed |
Affected products
- h2oai h2oai/h2o-3
Classification
- Weakness
-
- CWE-749 Exposed Dangerous Method or Function
References
-
huntr.com
/bounties/10f55937-0cba-4530-897f-2abf30ed5270
web, exploit, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2024-6863
advisory
-
github.com
/h2oai/h2o-3
package
-
github.com
/h2oai/h2o-3/blob/a20b5b19b769866ee24b217ee78b820e64c1cd6a/h2o-core/src/main/java/water/tools/EncryptionTool.j
web
-
pypi.org
/project/h2o
package
-
github.com
/advisories/GHSA-m37h-8r48-2cxj
advisory
Sources
- CVE List CVE-2024-6863
- GitHub Advisory GHSA-m37h-8r48-2cxj
- NVD CVE-2024-6863
- OSV PYSEC-2026-1442
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.