CVE-2021-25122 (GCVE-0-2021-25122)
Vulnerability from cvelistv5 – Published: 2021-03-01 12:00 – Updated: 2025-02-13 16:27
VLAI
EPSS
VEX
Title
Apache Tomcat h2c request mix-up
Summary
When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.
Severity
7.5 (High)
CWE
- CWE-200 - Information Exposure
Assigner
References
15 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Apache Software Foundation | Apache Tomcat |
Affected:
Apache Tomcat 10 , < 10.0.2
(custom)
Affected: Apache Tomcat 9 , < 9.0.42 (custom) Affected: Apache Tomcat 8.5 , < 8.5.62 (custom) |
guessed |
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"lang": "en",
"value": "When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A\u0027s request."
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{
"lang": "es",
"value": "Cuando se responde a nuevas peticiones de conexi\u00f3n h2c, Apache Tomcat versiones 10.0.0-M1 hasta 10.0.0, versiones 9.0.0.M1 hasta 9.0.41 y versiones 8.5.0 hasta 8.5.61, podr\u00edan duplicar los encabezados de petici\u00f3n y una cantidad limitada del cuerpo de petici\u00f3n de una petici\u00f3n a otra, lo que significa que el usuario A y el usuario B podr\u00edan visualizar los resultados de la petici\u00f3n del usuario A"
}
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"id": "CVE-2021-25122",
"lastModified": "2026-08-25T16:28:27.310",
"metrics": {
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"baseSeverity": "MEDIUM",
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"accessVector": "NETWORK",
"authentication": "NONE",
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"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
"version": "2.0"
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"source": "nvd@nist.gov",
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"Third Party Advisory"
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"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
}
],
"sourceIdentifier": "security@apache.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-200"
}
],
"source": "security@apache.org",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-200"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T21:39:57+00:00",
"cve": "CVE-2021-25122",
"id": "CVE-2021-25122",
"initial_release_date": "2021-03-01T00:00:00+00:00",
"product_status:fixed": "49",
"product_status:known_affected": "10",
"product_status:known_not_affected": "25",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "tomcat: Request mix-up with h2c",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-25122.json",
"version": "3"
}
}
}
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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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