CVE-2021-41819 (GCVE-0-2021-41819)
Vulnerability from cvelistv5 – Published: 2022-01-01 00:00 – Updated: 2025-05-22 15:00
VLAI
EPSS
VEX
Summary
CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-22 14:43 UTC
CWE
- n/a
- CWE-565 - Reliance on Cookies without Validation and Integrity Checking
Assigner
References
6 references
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"title": "CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby.",
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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T07:49:05+00:00",
"cve": "CVE-2021-41819",
"id": "CVE-2021-41819",
"initial_release_date": "2021-11-24T00:00:00+00:00",
"product_status:fixed": "1127",
"product_status:known_affected": "26",
"product_status:known_not_affected": "23",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "ruby: Cookie prefix spoofing in CGI::Cookie.parse",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-41819.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-02T02:22:07Z",
"cve": "CVE-2021-41819",
"id": "CVE-2021-41819",
"initial_release_date": "2023-02-15T03:37:23Z",
"product_status:known_affected": "435",
"product_status:recommended": "321",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-41819",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-41819.json",
"version": "54"
},
"vulnrichment": {
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"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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