CVE-2021-40346 (GCVE-0-2021-40346)
Vulnerability from cvelistv5 – Published: 2021-09-08 16:40 – Updated: 2024-08-04 02:27
VLAI
EPSS
VEX
Summary
An integer overflow exists in HAProxy 2.0 through 2.5 in htx_add_header that can be exploited to perform an HTTP request smuggling attack, allowing an attacker to bypass all configured http-request HAProxy ACLs and possibly other ACLs.
Severity
7.5 (High)
CWE
- n/a
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://www.mail-archive.com/haproxy%40formilux.org | x_refsource_MISC |
| https://git.haproxy.org/?p=haproxy.git | x_refsource_MISC |
| https://www.debian.org/security/2021/dsa-4968 | vendor-advisoryx_refsource_DEBIAN |
| https://www.mail-archive.com/haproxy%40formilux.o… | x_refsource_MISC |
| https://jfrog.com/blog/critical-vulnerability-in-… | x_refsource_MISC |
| https://github.com/haproxy/haproxy/commit/3b69886… | x_refsource_MISC |
| https://lists.apache.org/thread.html/r284567dd752… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r8a58fd7a298… | mailing-listx_refsource_MLIST |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
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},
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ACLs\"}],\"affected\":[{\"source\":\"cve@mitre.org\",\"affectedData\":[{\"vendor\":\"n/a\",\"product\":\"n/a\",\"versions\":[{\"version\":\"n/a\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:N/I:P/A:N\",\"baseScore\":5.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":10.0,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-190\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.0.0\",\"versionEndExcluding\":\"2.0.25\",\"matchCriteriaId\":\"2050D7B9-9E52-4564-9136-ABDB74F447A4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.2.0\",\"versionEndExcluding\":\"2.2.17\",\"matchCriteriaId\":\"4F0B3A48-87CC-490D-8C45-8BD6CCC01F80\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.3.0\",\"versionEndExcluding\":\"2.3.14\",\"matchCriteriaId\":\"677D5326-42B8-4DF5-A4C3-AEA5EBBA2164\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.4.0\",\"versionEndExcluding\":\"2.4.4\",\"matchCriteriaId\":\"CED60B4E-A8D6-47C8-8E62-FB1E8224E51F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:haproxy:haproxy:2.5:dev0:*:*:*:*:*:*\",\"matchCriteriaId\":\"4FC0BDE1-8904-4E26-B218-9F5FFF0F6F5D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:haproxy:haproxy:2.5:dev1:*:*:*:*:*:*\",\"matchCriteriaId\":\"2325B4E6-F5FE-4978-8AD7-9FDBF8D0355C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:haproxy:haproxy:2.5:dev2:*:*:*:*:*:*\",\"matchCriteriaId\":\"CD24FF4B-8E71-4111-AA2E-DC4DBC7D4961\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:haproxy:haproxy:2.5:dev3:*:*:*:*:*:*\",\"matchCriteriaId\":\"4589E520-FABF-438D-A7FB-EEDFD6EF75E5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:haproxy:haproxy:2.5:dev4:*:*:*:*:*:*\",\"matchCriteriaId\":\"3F9374A2-4E60-4BD7-81B0-53A8CE8019D1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:haproxy:haproxy:2.5:dev5:*:*:*:*:*:*\",\"matchCriteriaId\":\"D2291792-4194-4708-93E8-762B920B6DB0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:haproxy:haproxy:2.5:dev6:*:*:*:*:*:*\",\"matchCriteriaId\":\"42A575A1-A115-4AE7-8FEF-40356A9B17CD\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E460AA51-FCDA-46B9-AE97-E6676AA5E194\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A930E247-0B43-43CB-98FF-6CE7B8189835\"}]}]}],\"references\":[{\"url\":\"https://git.haproxy.org/?p=haproxy.git\",\"source\":\"cve@mitre.org\",\"tags\":[\"Patch\",\"Vendor 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Advisory\"]},{\"url\":\"https://lists.apache.org/thread.html/r284567dd7523f5823e2ce995f787ccd37b1cc4108779c50a97c79120%40%3Cdev.cloudstack.apache.org%3E\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.apache.org/thread.html/r8a58fd7a29808e5d27ee56877745e58dc4bb041b9af94601554e2a5a%40%3Cdev.cloudstack.apache.org%3E\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A7V2IYO22LWVBGUNZWVKNTMDV4KINLFO/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXTSBY2TEAXWZVFQM3CXHJFRONX7PEMN/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://www.debian.org/security/2021/dsa-4968\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.mail-archive.com/haproxy%40formilux.org\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://www.mail-archive.com/haproxy%40formilux.org/msg41114.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2025-11-21T15:10:12+00:00",
"cve": "CVE-2021-40346",
"id": "CVE-2021-40346",
"initial_release_date": "2021-09-08T17:37:00+00:00",
"product_status:fixed": "37",
"product_status:known_affected": "2",
"product_status:known_not_affected": "121",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "haproxy: request smuggling attack or response splitting via duplicate content-length header",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-40346.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-08-26T02:26:22Z",
"cve": "CVE-2021-40346",
"id": "CVE-2021-40346",
"initial_release_date": "2023-02-15T03:37:58Z",
"product_status:known_not_affected": "11",
"product_status:recommended": "14",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-40346",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-40346.json",
"version": "16"
}
}
}
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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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