High severity · published Nov 25, 2025
CVE-2025-9624
OpenSearch 3.2.0 - Nested Boolean/Disjunction asymmetric DoS
7.5
CVSS
0.7%
EPSS
No
On KEV
Description
A vulnerability in OpenSearch allows attackers to cause Denial of Service (DoS) by submitting complex query_string inputs.
This issue affects all OpenSearch versions between 3.0.0 and < 3.3.0 and OpenSearch < 2.19.4.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenSearch · OpenSearch
3.0.0 before 3.3.0; 1.0.0 before 2.19.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-9624
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-9624
Exploit
https://fluidattacks.com/advisories/chick
github.com
https://github.com/opensearch-project/OpenSearch/releases/tag/2.19.4
github.com
https://github.com/opensearch-project/OpenSearch/releases/tag/3.3.0
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