CPE Guesser is a command-line tool or web service designed to guess the CPE name based on one or more keywords. The resulting CPE can then be used with tools like cve-search or vulnerability-lookup to perform actual searches using CPE names.

• Valkey
• Python

To use CPE Guesser, you need to initialize the Valkey database with import.py.

Once initialized, you can use the software with lookup.py to find the most probable CPE matching the provided keywords.

Alternatively, you can call the web server (after running server.py). For example:

curl -s -X POST http://localhost:8000/search -d '{"query": ["tomcat"]}' | jq .

1. git clone https://github.com/cve-search/cpe-guesser.git
2. cd cpe-guesser
3. Download the CPE dictionary & populate the database with python3 ./bin/import.py (the NVD JSON importer now uses parallel workers by default; tune with --workers and --batch-size if needed).
4. Optionally enrich the vendor/product ranking with CVE v5 data dumps using python3 ./bin/import_cvelistv5.py. This downloads ./data/cvelistv5.ndjson only when missing unless you pass --download, and it now resets rank:cpe, rank:vendor_product, set:missing_vendors_from_cvelistv5, and set:missing_products_from_cvelistv5 before each import unless you opt into --preserve-rank. Use --index-words if you also want to populate w:<word> and s:<word> from CVE v5 data, and review the missing vendor/product sets for words that were not already indexed in Valkey.
5. Take a cup of black or green tea ().
6. python3 ./bin/server.py to run the local HTTP server.

If you don't want to install it locally, there is a public online version. Check below.

docker build . -t cpe-guesser:l.0
# Edit settings.yaml content and/or path
docker run cpe-guesser:l.0 -v $(pwd)/config/settings.yaml:/app/config/settings.yaml
# Please wait for full import

cd docker
# Edit docker/settings.yaml as you want
docker-compose up --build -d
# Please wait for full import

If you do not want to use the Web server, lookup.py can still be used. Example: docker exec -it cpe-guesser python3 /app/bin/lookup.py tomcat

cpe-guesser.cve-search.org is public online version of CPE guesser which can be used via a simple API. The endpoint is /search and the JSON is composed of a query list with the list of keyword(s) to search for.

curl -s -X POST https://cpe-guesser.cve-search.org/search -d "{\"query\": [\"outlook\", \"connector\"]}" | jq .

[
  [
    18117,
    "cpe:2.3:a:microsoft:outlook_connector"
  ],
  [
    60947,
    "cpe:2.3:a:oracle:oracle_communications_unified_communications_suite_connector_for_microsoft_outlook"
  ],
  [
    68306,
    "cpe:2.3:a:oracle:corporate_time_outlook_connector"
  ]
]

The endpoint /unique is available to retrieve only the best-matching CPE entry.

curl -s -X POST https://cpe-guesser.cve-search.org/unique -d "{\"query\": [\"outlook\", \"connector\"]}" | jq .

"cpe:2.3:a:oracle:corporate_time_outlook_connector"

usage: lookup.py [-h] [--unique] WORD [WORD ...]

Find potential CPE names from a list of keyword(s) and return a JSON of the results

positional arguments:
  WORD        One or more keyword(s) to lookup

options:
  -h, --help  show this help message and exit
  --unique    Return the best CPE matching the keywords given

python3 lookup.py microsoft sql server | jq .

[
  [
    51325,
    "cpe:2.3:a:microsoft:sql_server_2017_reporting_services"
  ],
  [
    51326,
    "cpe:2.3:a:microsoft:sql_server_2019_reporting_services"
  ],
  [
    57898,
    "cpe:2.3:a:quest:intrust_knowledge_pack_for_microsoft_sql_server"
  ],
  [
    60386,
    "cpe:2.3:o:microsoft:sql_server"
  ],
  [
    60961,
    "cpe:2.3:a:microsoft:sql_server_desktop_engine"
  ],
  [
    64810,
    "cpe:2.3:a:microsoft:sql_server_reporting_services"
  ],
  [
    75858,
    "cpe:2.3:a:microsoft:sql_server_management_studio"
  ],
  [
    77570,
    "cpe:2.3:a:microsoft:sql_server"
  ],
  [
    78206,
    "cpe:2.3:a:ibm:tivoli_storage_manager_for_databases_data_protection_for_microsoft_sql_server"
  ]
]

A CPE entry is composed of a human readable name with some references and the structured CPE name.

NVD CPE Dictionary 2.0 JSON feeds:

    {
      "cpe": {
        "deprecated": false,
        "cpeName": "cpe:2.3:a:10web:form_maker:1.7.17:*:*:*:*:wordpress:*:*",
        "cpeNameId": "A6F0EC33-CD55-4FE2-8B55-5C0F9CC88BF9",
        "lastModified": "2019-06-04T16:47:17.300",
        "created": "2019-06-04T16:47:17.300",
        "titles": [
          {
            "title": "10web Form Maker 1.7.17 for WordPress",
            "lang": "en"
          }
        ],
        "refs": [
          {
            "ref": "https://wordpress.org/plugins/form-maker/#developers",
            "type": "Change Log"
          }
        ]
      }
    },

Legacy XML feeds:

  <cpe-item name="cpe:/a:10web:form_maker:1.7.17::~~~wordpress~~">
    <title xml:lang="en-US">10web Form Maker 1.7.17 for WordPress</title>
    <references>
      <reference href="https://wordpress.org/plugins/form-maker/#developers">Change Log</reference>
    </references>
    <cpe-23:cpe23-item name="cpe:2.3:a:10web:form_maker:1.7.17:*:*:*:*:wordpress:*:*"/>
  </cpe-item>

The CPE name is structured with a vendor name, a product name and some additional information. CPE name can be easily changed due to vendor name or product name changes, some vendor/product are sharing common names or name is composed of multiple words.

Split vendor name and product name (such as _) into single word(s) and then canonize the word. Building an inverse index using the cpe vendor:product format as value and the canonized word as key. Then cpe guesser creates a ranked set with the most common cpe (vendor:product) per version to give a probability of the CPE appearance.

You can also build the ranking directly from the CVE v5 NDJSON dump. The importer scans the full record recursively so it can pick up CPE values from both affected-product metadata and vulnerable configuration blocks, then increments the rank:cpe and rank:vendor_product sorted sets using the normalized cpe:2.3:<part>:<vendor>:<product> tuple. It also records vendor words whose w:<word> set does not already exist into set:missing_vendors_from_cvelistv5 and product words into set:missing_products_from_cvelistv5, and --index-words lets the CVE v5 importer populate w:<word> and s:<word> just like the NVD importer.

• w:<word> set
• s:<word> sorted set with a score depending of the number of appearance
• rank:cpe sorted set of common vendor:product tuples
• rank:vendor_product alias sorted set of the same tuple ranking, populated by both importers
• set:missing_vendors_from_cvelistv5 set of vendor words seen in CVE v5 CPEs that were not already present as w:<word> keys before the record was processed
• set:missing_products_from_cvelistv5 set of product words seen in CVE v5 CPEs that were not already present as w:<word> keys before the record was processed

Software is open source and released under a 2-Clause BSD License

  Copyright (C) 2021-2026 Alexandre Dulaunoy
  Copyright (C) 2021-2026 Esa Jokinen
  Copyright (C) 2026 CIRCL - Computer Incident Response Center Luxembourg

We welcome contributions! All contributors collectively own the CPE Guesser project. By contributing, contributors also acknowledge the Developer Certificate of Origin when submitting pull requests or using other methods of contribution.