Security readout for executives and security teams
Plain-English summary
This flaw can let specially crafted HTTP token authentication input consume excessive server resources, causing a denial of service. Business impact is service disruption, not data theft, based on the supplied sources. Exposure depends on running vulnerable Rails Action Pack versions and using the affected token authentication helpers.
Executive priority
Treat as a targeted availability risk. Prioritize patching public or critical Rails services using HTTP token authentication, especially where downtime affects revenue, operations, or customer access.
Technical view
CVE-2021-22904 affects the actionpack gem in Rails before the listed fixed releases. The issue is in Action Controller Token Authentication, where an overly permissive regular expression can cause denial of service when impacted code uses authenticate_or_request_with_http_token or authenticate_with_http_token.
Likely exposure
Internet-facing Rails applications are most relevant when they run affected actionpack versions and use the named token authentication methods. Applications not using those helpers have materially lower exposure from the provided evidence.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. Public references include a HackerOne report and Rails advisory, but the provided data supports only possible denial of service, not compromise or confirmed exploitation.
Researcher notes
Evidence is specific to Action Controller Token Authentication and CWE-400 resource consumption. The bundle lacks CVSS detail and does not prove exploitation. Avoid broad Rails exposure claims unless code review confirms the affected helpers are used.
Mitigation direction
- Upgrade actionpack/Rails to the listed fixed releases or later.
- Prioritize externally reachable applications using token authentication helpers.
- Check Rails and vendor advisories for environment-specific guidance.
- Review dependent products against vendor advisories, including NetApp where applicable.
Validation and detection
- Inventory deployed actionpack gem versions across Rails applications.
- Identify code paths using authenticate_or_request_with_http_token.
- Identify code paths using authenticate_with_http_token.
- Confirm production builds run fixed Rails or actionpack releases.
- Review service metrics for unexplained resource spikes around token-authenticated endpoints.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-400: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-22904 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://hackerone.com/reports/1101125CVE reference · x_refsource_MISC
- https://discuss.rubyonrails.org/t/cve-2021-22904-possible-dos-vulnerability-in-action-controller-token-authentication/77869CVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210805-0009/CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.