CVE-2015-4520 (GCVE-0-2015-4520)
Vulnerability from cvelistv5 – Published: 2015-09-24 01:00 – Updated: 2024-08-06 06:18
VLAI
EPSS
VEX
Summary
Mozilla Firefox before 41.0 and Firefox ESR 38.x before 38.3 allow remote attackers to bypass CORS preflight protection mechanisms by leveraging (1) duplicate cache-key generation or (2) retrieval of a value from an incorrect HTTP Access-Control-* response header.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
21 references
Date Public
2015-09-22 00:00
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\"http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"http://www.securityfocus.com/bid/76816\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"http://www.securitytracker.com/id/1033640\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"http://www.ubuntu.com/usn/USN-2743-1\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"http://www.ubuntu.com/usn/USN-2743-2\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"http://www.ubuntu.com/usn/USN-2743-3\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"http://www.ubuntu.com/usn/USN-2743-4\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"http://www.ubuntu.com/usn/USN-2754-1\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://bugzilla.mozilla.org/show_bug.cgi?id=1200856\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://bugzilla.mozilla.org/show_bug.cgi?id=1200869\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
"sourceIdentifier": "security@mozilla.org",
"vulnStatus": "Modified",
"weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-254\"}]}]"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2015-4520\",\"sourceIdentifier\":\"security@mozilla.org\",\"published\":\"2015-09-24T04:59:19.253\",\"lastModified\":\"2026-05-06T22:30:45.220\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Mozilla Firefox before 41.0 and Firefox ESR 38.x before 38.3 allow remote attackers to bypass CORS preflight protection mechanisms by leveraging (1) duplicate cache-key generation or (2) retrieval of a value from an incorrect HTTP Access-Control-* response header.\"},{\"lang\":\"es\",\"value\":\"Vulnerabilidad en Mozilla Firefox en versiones anteriores a 41.0 y Firefox ESR 38.x en versiones anteriores a 38.3, permite a atacantes remotos eludir los mecanismos de protecci\u00f3n de verificaci\u00f3n CORS preflight aprovechando la (1) generaci\u00f3n de cache-key duplicada o (2) recuperaci\u00f3n de un valor desde una respuesta de cabecera HTTP Acces-Control-* incorrecta.\"}],\"metrics\":{\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:P/I:P/A:N\",\"baseScore\":6.4,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":10.0,\"impactScore\":4.9,\"acInsufInfo\":true,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-254\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox:38.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"35BF0AFB-26BA-4BEA-B6B8-11CF88E951DE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox:38.0.1:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"1F007CC6-9391-4E1C-A747-F3DE5E572FA5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox:38.0.5:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"45E9641F-430C-4B3A-BD63-EC13DBD3D1E4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox:38.1.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"5AADD23B-A8AF-4679-990D-C29A1D6EB5CD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox:38.1.1:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"1343A1FD-98CF-4A6C-A697-1253E538FD5C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox:38.2.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"6D098567-B55E-4EAC-8FAA-31FAFDD4058F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox:38.2.1:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"BE0389BC-D295-4957-8AE7-EDAC770F596D\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"40.0.3\",\"matchCriteriaId\":\"4EE7B0EF-4A3A-4353-8B50-6F28B5CADBDB\"}]}]}],\"references\":[{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00000.html\",\"source\":\"security@mozilla.org\"},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00003.html\",\"source\":\"security@mozilla.org\"},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00004.html\",\"source\":\"security@mozilla.org\"},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00005.html\",\"source\":\"security@mozilla.org\"},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00007.html\",\"source\":\"security@mozilla.org\"},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00025.html\",\"source\":\"security@mozilla.org\"},{\"url\":\"http://rhn.redhat.com/errata/RHSA-2015-1834.html\",\"source\":\"security@mozilla.org\"},{\"url\":\"http://rhn.redhat.com/errata/RHSA-2015-1852.html\",\"source\":\"security@mozilla.org\"},{\"url\":\"http://www.debian.org/security/2015/dsa-3365\",\"source\":\"security@mozilla.org\"},{\"url\":\"http://www.mozilla.org/security/announce/2015/mfsa2015-111.html\",\"source\":\"security@mozilla.org\",\"tags\":[\"Vendor 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"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2025-11-21T14:28:25+00:00",
"cve": "CVE-2015-4520",
"id": "CVE-2015-4520",
"initial_release_date": "2015-09-22T00:00:00+00:00",
"product_status:fixed": "243",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "Mozilla: Errors in the handling of CORS preflight request headers (MFSA 2015-111)",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2015/cve-2015-4520.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-01T02:30:00Z",
"cve": "CVE-2015-4520",
"id": "CVE-2015-4520",
"initial_release_date": "2023-02-15T05:17:44Z",
"product_status:known_affected": "1",
"product_status:recommended": "468",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2015-4520",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2015-4520.json",
"version": "18"
}
}
}
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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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