CVE-2021-22101Network attack vector

Database denial of service via label selectors

Published Oct 27, 2021 · Updated Aug 3, 2024

Denial of service in Cloud Foundry Foundation CAPI before 1.118.0 allows remote attackers to make the ccdb database unavailable. Multiple V3 REST endpoints translate attacker-supplied label_selectors into enormous SQL queries that exhaust the database. No authentication or user interaction is required; successful requests interrupt Cloud Controller operations that depend on ccdb.

CVSS severity7.5
High
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Cloud Foundry Foundation CAPI before 1.118.0 allows remote attackers to make the ccdb database unavailable. Multiple V3 REST endpoints translate attacker-supplied label_selectors into enormous SQL queries that exhaust the database. No authentication or user interaction is required; successful requests interrupt Cloud Controller operations that depend on ccdb.

The record

CVE
CVE-2021-22101
Published
Oct 27, 2021
Updated
Aug 3, 2024
Vendor
Cloud Foundry Foundation
Product
Cloud Foundry API (CAPI)
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Cloud Foundry Cloud Controller versions prior to 1.118.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cloud Foundry Foundation · Cloud Foundry API (CAPI)version=Cloud Foundry Cloud Controller versions prior to 1.118.0

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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