CVE-2021-3690 (GCVE-0-2021-3690)
Vulnerability from cvelistv5 – Published: 2022-08-23 15:50 – Updated: 2024-08-03 17:01
VLAI
EPSS
VEX
Summary
A flaw was found in Undertow. A buffer leak on the incoming WebSocket PONG message may lead to memory exhaustion. This flaw allows an attacker to cause a denial of service. The highest threat from this vulnerability is availability.
Severity
7.5 (High)
CWE
- CWE-400 - - Uncontrolled Resource Consumption
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://issues.redhat.com/browse/UNDERTOW-1935 | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=1991299 | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2021-3690 | x_refsource_MISC |
| https://github.com/undertow-io/undertow/commit/c7… | x_refsource_MISC |
Impacted products
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"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-09-07T13:51:26+00:00",
"cve": "CVE-2021-3690",
"id": "CVE-2021-3690",
"initial_release_date": "2021-07-30T00:00:00+00:00",
"product_status:fixed": "294",
"product_status:known_affected": "6",
"product_status:known_not_affected": "2727",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "undertow: buffer leak on incoming websocket PONG message may lead to DoS",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-3690.json",
"version": "3"
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}
}
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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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