CVE-2021-3537 (GCVE-0-2021-3537)
Vulnerability from cvelistv5 – Published: 2021-05-14 19:50 – Updated: 2024-08-03 17:01
VLAI
EPSS
VEX
Summary
A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated, the flaw could be used to crash the application. The highest threat from this vulnerability is to system availability.
Severity
5.9 (Medium)
CWE
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
| https://bugzilla.redhat.com/show_bug.cgi?id=1956522 | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://security.gentoo.org/glsa/202107-05 | vendor-advisoryx_refsource_GENTOO |
| https://security.netapp.com/advisory/ntap-2021062… | x_refsource_CONFIRM |
| https://www.oracle.com/security-alerts/cpuoct2021.html | x_refsource_MISC |
| https://www.oracle.com/security-alerts/cpuapr2022.html | x_refsource_MISC |
| https://www.oracle.com/security-alerts/cpujul2022.html | x_refsource_MISC |
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"title": "A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated the flaw could be used to crash the application. The highest threat from this vulnerability is to system availability.",
"url": "https://msrc.microsoft.com/csaf/vex/2021/msrc_cve-2021-3537.json",
"version": "1"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2021-3537\",\"sourceIdentifier\":\"secalert@redhat.com\",\"published\":\"2021-05-14T20:15:16.553\",\"lastModified\":\"2024-11-21T06:21:47.317\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated, the flaw could be used to crash the application. The highest threat from this vulnerability is to system availability.\"},{\"lang\":\"es\",\"value\":\"Una vulnerabilidad encontrada en libxml2 en versiones anteriores a 2.9.11 muestra que no propag\u00f3 errores al analizar el contenido mixto XML, causando una desreferencia de NULL.\u0026#xa0;Si un documento XML que no es confiable fue analizado en modo de recuperaci\u00f3n y pos-comprobado, el fallo podr\u00eda usarse para bloquear la aplicaci\u00f3n.\u0026#xa0;La mayor amenaza de esta vulnerabilidad es la disponibilidad del sistema\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.2,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:N/I:N/A:P\",\"baseScore\":4.3,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":8.6,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"secalert@redhat.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"2.9.11\",\"matchCriteriaId\":\"208AF535-5D38-45B4-B227-2892611C5A20\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:redhat:jboss_core_services:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"9B453CF7-9AA6-4B94-A003-BF7AE0B82F53\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"2F6AB192-9D7D-4A9A-8995-E53A9DE9EAFC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"142AD0DD-4CF3-4D74-9442-459CE3347E3A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"F4CFF558-3C47-480D-A2F0-BABF26042943\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DEECE5FC-CACF-4496-A3E7-164736409252\"}]}]},{\"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\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*\",\"matchCriteriaId\":\"3A756737-1CC4-42C2-A4DF-E1C893B4E2D5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"1FE996B1-6951-4F85-AA58-B99A379D2163\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netapp:clustered_data_ontap_antivirus_connector:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"62347994-1353-497C-9C4A-D5D8D95F67E8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netapp:manageability_software_development_kit:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"D39DCAE7-494F-40B2-867F-6C6A077939DD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E7CF3019-975D-40BB-A8A4-894E62BD3797\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netapp:snapdrive:-:*:*:*:*:windows:*:*\",\"matchCriteriaId\":\"BEDE62C6-D571-4AF8-B85E-CBBCE4AF98B5\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:netapp:hci_h410c_firmware:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"08C564D8-E21F-403C-B4BB-7B14B7FB5DAE\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:netapp:hci_h410c:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"8532F5F0-00A1-4FA9-A80B-09E46D03F74F\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"C2A5B24D-BDF2-423C-98EA-A40778C01A05\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:enterprise_manager_base_platform:13.4.0.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"D26F3E23-F1A9-45E7-9E5F-0C0A24EE3783\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:enterprise_manager_base_platform:13.5.0.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"6E8758C8-87D3-450A-878B-86CE8C9FC1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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T11:21:10+00:00",
"cve": "CVE-2021-3537",
"id": "CVE-2021-3537",
"initial_release_date": "2021-05-01T00:00:00+00:00",
"product_status:fixed": "193",
"product_status:known_affected": "10",
"product_status:known_not_affected": "4",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "libxml2: NULL pointer dereference when post-validating mixed content parsed in recovery mode",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-3537.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-08-31T02:11:30Z",
"cve": "CVE-2021-3537",
"id": "CVE-2021-3537",
"initial_release_date": "2023-02-15T03:49:13Z",
"product_status:known_affected": "193",
"product_status:known_not_affected": "82",
"product_status:recommended": "640",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-3537",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-3537.json",
"version": "46"
}
}
}
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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.
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.
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