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[email protected]CVE-2021-33193

HistoryAug 16, 2021 - 8:15 a.m.

CVE-2021-33193

2021-08-1608:15:11

[email protected]

web.nvd.nist.gov

1388

cve-2021-33193

http/2

request validation

apache

mod_proxy

request splitting

cache poisoning

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

AI Score

7.7

Confidence

High

EPSS

0.001

Percentile

47.3%

JSON

A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.

Affected configurations

Vulners

NVD

Node

apache_software_foundationapache_strutsRange2.4.17–2.4.48

VendorProductVersionCPE
apachehttp_servercpe:/a:apache:http_server::::

Vendor	Product	Version	CPE
apache	http_server		cpe:/a:apache:http_server::::

CNA Affected

[
  {
    "vendor": "Apache Software Foundation",
    "product": "Apache HTTP Server",
    "versions": [
      {
        "version": "Apache HTTP Server 2.4 2.4.17 to 2.4.48",
        "status": "affected"
      }
    ]
  }
]