CVE-2021-33620 (GCVE-0-2021-33620)
Vulnerability from cvelistv5 – Published: 2021-05-28 00:00 – Updated: 2024-08-03 23:58
VLAI
EPSS
VEX
Summary
Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to exist in HTTP traffic without any malicious intent by the server.
Severity
6.5 (Medium)
CWE
- n/a
Assigner
References
8 references
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"redhat_vex": {
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"current_release_date": "2025-11-21T15:56:58+00:00",
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"id": "CVE-2021-33620",
"initial_release_date": "2021-05-10T00:00:00+00:00",
"product_status:fixed": "30",
"product_status:known_affected": "8",
"product_status:known_not_affected": "2",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "squid: denial of service in HTTP response processing",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-33620.json",
"version": "3"
},
"suse_vex": {
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"current_release_date": "2026-09-13T00:03:10Z",
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"id": "CVE-2021-33620",
"initial_release_date": "2023-02-15T03:40:21Z",
"product_status:known_affected": "400",
"product_status:known_not_affected": "7",
"product_status:recommended": "49",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-33620",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-33620.json",
"version": "37"
}
}
}
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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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