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CVE-2021-22904

HIGH
7.5
CVSS Score
Published: June 11, 2021 at 03:49 PM UTC
Updated: June 17, 2026 at 03:37 AM UTC
1 product affected across 1 vendorRails

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Severity
HIGH7.5
Exploit prediction
EPSS 5%

Description

The actionpack ruby gem before 6.1.3.2, 6.0.3.7, 5.2.4.6, 5.2.6 suffers from a possible denial of service vulnerability in the Token Authentication logic in Action Controller due to a too permissive regular expression. Impacted code uses `authenticate_or_request_with_http_token` or `authenticate_with_http_token` for request authentication.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Rails· Rubyonrails
95%
v < 5.2.4.65.2.5 ≤ v < 5.2.66.0.0 ≤ v < 6.0.3.76.1.0 ≤ v < 6.1.3.2
Affected range stops below 5.2.4.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.2.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.0.3.7, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 6.1.3.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCExploitMitigationPatchVendor Advisory
Source: [email protected]
https://discuss.rubyonrails.org/t/cve-2021-22904-possible-dos-vulnerability-in-action-controller-token-authentication/77869
x_refsource_MISCPermissions RequiredThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/1101125
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20210805-0009/

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400NVD-CWE-Other

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