CVE-2021-26690 (GCVE-0-2021-26690)

Vulnerability from cvelistv5 – Published: 2021-06-10 07:10 – Updated: 2024-08-03 20:33
VLAI
Title
mod_session NULL pointer dereference
Summary
Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can cause a NULL pointer dereference and crash, leading to a possible Denial Of Service
Severity
No CVSS data available.
CWE
  • mod_session NULL pointer dereference
Assigner
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache HTTP Server Affected: 2.4.46
Affected: 2.4.43
Affected: 2.4.41
Affected: 2.4.39
Affected: 2.4.38
Affected: 2.4.37
Affected: 2.4.35
Affected: 2.4.34
Affected: 2.4.33
Affected: 2.4.29
Affected: 2.4.28
Affected: 2.4.27
Affected: 2.4.26
Affected: 2.4.25
Affected: 2.4.23
Affected: 2.4.20
Affected: 2.4.18
Affected: 2.4.17
Affected: 2.4.16
Affected: 2.4.12
Affected: 2.4.10
Affected: 2.4.9
Affected: 2.4.7
Affected: 2.4.6
Affected: 2.4.4
Affected: 2.4.3
Affected: 2.4.2
Affected: 2.4.1
Affected: 2.4.0
Create a notification for this product.
Credits
This issue was discovered and reported by GHSL team member @antonio-morales (Antonio Morales)
Show details on NVD website
To clipboard 

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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-26690",
      "date": "2026-05-31",
      "epss": "0.60353",
      "percentile": "0.98309"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-26690\",\"sourceIdentifier\":\"security@apache.org\",\"published\":\"2021-06-10T07:15:07.543\",\"lastModified\":\"2024-11-21T05:56:40.893\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can cause a NULL pointer dereference and crash, leading to a possible Denial Of Service\"},{\"lang\":\"es\",\"value\":\"Apache HTTP Server versiones 2.4.0 a 2.4.46, un encabezado de Cookie especialmente dise\u00f1ado y gestionado por la funci\u00f3n mod_session puede causar una desviaci\u00f3n del puntero NULL y un fallo, lo que puede causar una denegaci\u00f3n de servicio\"}],\"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:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"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:N/A:P\",\"baseScore\":5.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"PARTIAL\"},\"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-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.4.0\",\"versionEndIncluding\":\"2.4.46\",\"matchCriteriaId\":\"8375A8C8-38EB-4F32-97FD-0841D57C1971\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DEECE5FC-CACF-4496-A3E7-164736409252\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"07B237A9-69A3-4A9C-9DA0-4E06BD37AE73\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A930E247-0B43-43CB-98FF-6CE7B8189835\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"80E516C0-98A4-4ADE-B69F-66A772E2BAAA\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"B095CC03-7077-4A58-AB25-CC5380CDCE5A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"82EA4BA7-C38B-4AF3-8914-9E3D089EBDD4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"B9C9BC66-FA5F-4774-9BDA-7AB88E2839C4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F69B9A5-F21B-4904-9F27-95C0F7A628E3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"D3E503FB-6279-4D4A-91D8-E237ECF9D2B0\"}]}]}],\"references\":[{\"url\":\"http://httpd.apache.org/security/vulnerabilities_24.html\",\"source\":\"security@apache.org\",\"tags\":[\"Release 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  }
}


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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.