BIT-modsecurity2-2021-42717

BIT-modsecurity2-2021-42717 PUBLISHED CVSS 7.5 HIGH

Record from OSV · Published March 6, 2024

ModSecurity 3.x through 3.0.5 mishandles excessively nested JSON objects. Crafted JSON objects with nesting tens-of-thousands deep could result in the web server being unable to service legitimate requests. Even a moderately large (e.g., 300KB) HTTP request can occupy one of the limited NGINX worker processes for minutes and consume almost all of the available CPU on the machine. Modsecurity 2 is similarly vulnerable: the affected versions include 2.8.0 through 2.9.4.

Fixed versions

Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.

Package	Ecosystem	Fixed in
modsecurity2	Bitnami	2.9.5

Risk scores

CVSS 3.1

7.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Vendor	Product	Versions
Bitnami	modsecurity2	2.0.0

Timeline

Mar 6, 2024 CVE Published
Jul 4, 2025 CVE Updated
May 15, 2026 Distribution Patch

Query this with the API

The same record, from the CLI:

vulnetix vdb vuln BIT-modsecurity2-2021-42717
vulnetix vdb fixes BIT-modsecurity2-2021-42717

Or with curl, using the org id and key from your account page:

curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/BIT-modsecurity2-2021-42717/fixes/registry"

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References

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