CVE-2021-40438 (GCVE-0-2021-40438)

Vulnerability from cvelistv5 – Published: 2021-09-16 14:40 – Updated: 2025-10-21 23:25
VLAI CISA KEV
Title
mod_proxy SSRF
Summary
A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.
Severity
9 (Critical)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-918 - Server Side Request Forgery (SSRF)
Assigner
References
URL Tags
https://httpd.apache.org/security/vulnerabilities… x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.apache.org/thread.html/r82838efc5fa… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r82c077663f9… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r3925e167d5e… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r61fdbfc26ab… mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.debian.org/debian-lts-announce/2021… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r2eb200ac134… mailing-listx_refsource_MLIST
https://www.debian.org/security/2021/dsa-4982 vendor-advisoryx_refsource_DEBIAN
https://lists.apache.org/thread.html/r210807d0bb5… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rf6954e60b1c… mailing-listx_refsource_MLIST
https://tools.cisco.com/security/center/content/C… vendor-advisoryx_refsource_CISCO
https://www.oracle.com/security-alerts/cpujan2022.html x_refsource_MISC
https://www.tenable.com/security/tns-2021-17 x_refsource_CONFIRM
https://security.netapp.com/advisory/ntap-2021100… x_refsource_CONFIRM
https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
https://cert-portal.siemens.com/productcert/pdf/s… x_refsource_CONFIRM
https://security.gentoo.org/glsa/202208-20 vendor-advisoryx_refsource_GENTOO
https://www.cisa.gov/known-exploited-vulnerabilit… government-resource
Impacted products
Vendor Product Version
Apache Software Foundation Apache HTTP Server Affected: Apache HTTP Server 2.4 , ≤ 2.4.48 (custom)
Create a notification for this product.
Credits
The issue was discovered by the Apache HTTP security team while analysing CVE-2021-36160
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 38799646-2460-4afe-b5b9-a92164d0fe1d

Vulnerability ID: CVE-2021-40438

Status: Confirmed

Status Updated: 2021-12-01 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-12-01
Asserted: 2021-12-01
Scope
Notes: KEV entry: Apache HTTP Server-Side Request Forgery (SSRF) | Affected: Apache / Apache | Description: A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier. | Required action: Apply updates per vendor instructions. | Due date: 2021-12-15 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-40438
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-918
Feed CISA Known Exploited Vulnerabilities Catalog
Product Apache
Due Date 2021-12-15
Date Added 2021-12-01
Vendorproject Apache
Vulnerabilityname Apache HTTP Server-Side Request Forgery (SSRF)
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:28 UTC | Updated: 2026-02-06 07:17 UTC
Show details on NVD website
To clipboard 

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              "url": "https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432@%3Cusers.httpd.apache.org%3E"
            },
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              "name": "[httpd-users] 20210923 Re: [users@httpd] Re: [External] : [users@httpd] 2.4.49 security fixes: more info",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c@%3Cusers.httpd.apache.org%3E"
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              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/"
            },
            {
              "name": "[debian-lts-announce] 20211002 [SECURITY] [DLA 2776-1] apache2 security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html"
            },
            {
              "name": "[httpd-bugs] 20211008 [Bug 65616] CVE-2021-36160 regression",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37@%3Cbugs.httpd.apache.org%3E"
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              "name": "DSA-4982",
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              "url": "https://www.debian.org/security/2021/dsa-4982"
            },
            {
              "name": "[httpd-users] 20211019 [users@httpd] Regarding CVE-2021-40438",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a@%3Cusers.httpd.apache.org%3E"
            },
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              "name": "[httpd-users] 20211019 Re: [users@httpd] Regarding CVE-2021-40438",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/rf6954e60b1c8e480678ce3d02f61b8a788997785652e9557a3265c00@%3Cusers.httpd.apache.org%3E"
            },
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              "name": "20211124 Multiple Vulnerabilities in Apache HTTP Server Affecting Cisco Products: November 2021",
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              "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ"
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            {
              "name": "https://www.oracle.com/security-alerts/cpujan2022.html",
              "refsource": "MISC",
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            {
              "name": "https://www.tenable.com/security/tns-2021-17",
              "refsource": "CONFIRM",
              "url": "https://www.tenable.com/security/tns-2021-17"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20211008-0004/",
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              "url": "https://security.netapp.com/advisory/ntap-20211008-0004/"
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          ]
        },
        "source": {
          "discovery": "UNKNOWN"
        },
        "timeline": [
          {
            "lang": "en",
            "time": "2021-09-16T00:00:00.000Z",
            "value": "2.4.49 released"
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        ]
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2021-40438",
    "datePublished": "2021-09-16T14:40:23.000Z",
    "dateReserved": "2021-09-02T00:00:00.000Z",
    "dateUpdated": "2025-10-21T23:25:32.274Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
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      "cveID": "CVE-2021-40438",
      "cwes": "[\"CWE-918\"]",
      "dateAdded": "2021-12-01",
      "dueDate": "2021-12-15",
      "knownRansomwareCampaignUse": "Unknown",
      "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-40438",
      "product": "Apache",
      "requiredAction": "Apply updates per vendor instructions.",
      "shortDescription": "A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.",
      "vendorProject": "Apache",
      "vulnerabilityName": "Apache HTTP Server-Side Request Forgery (SSRF)"
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      "cisaExploitAdd": "2021-12-01",
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      "cisaVulnerabilityName": "Apache HTTP Server-Side Request Forgery (SSRF)",
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.\"}, {\"lang\": \"es\", \"value\": \"Un uri-path dise\\u00f1ado puede causar que mod_proxy reenv\\u00ede la petici\\u00f3n a un servidor de origen elegido por el usuario remoto. Este problema afecta a Apache HTTP Server versiones 2.4.48 y anteriores\"}]",
      "id": "CVE-2021-40438",
      "lastModified": "2024-11-21T06:24:06.787",
      "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:C/C:H/I:H/A:H\", \"baseScore\": 9.0, \"baseSeverity\": \"CRITICAL\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"CHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 2.2, \"impactScore\": 6.0}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:M/Au:N/C:P/I:P/A:P\", \"baseScore\": 6.8, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"MEDIUM\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"PARTIAL\", \"integrityImpact\": \"PARTIAL\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 8.6, \"impactScore\": 6.4, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
      "published": "2021-09-16T15:15:07.633",
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Advisory\"]}, {\"url\": \"https://www.debian.org/security/2021/dsa-4982\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2022.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpujan2022.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.tenable.com/security/tns-2021-17\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}]",
      "sourceIdentifier": "security@apache.org",
      "vulnStatus": "Modified",
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}


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Tags
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.