Intelligence online17 sources monitored8 actively exploited 7d26 published 24hChecked recently
Vulnerability record

CVE-2021-40438

Apache HTTP Server-Side Request Forgery (SSRF)

CriticalExploitation confirmedCISA KEV Used by ransomware
What should I do?

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run Apache, fix it now.

CISA required action: Apply updates per vendor instructions.

US federal civilian agencies must remediate by Dec 15, 2021.

Patch status

Official fix available since

Apply the vendor's update to every affected system. Check the fixed-in versions below where known.

Basis: NVD patch reference

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.

Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.

Affected products

ProductVendorAffected versionsSource
ApacheApache Software Foundation—KEV
Apache HTTP ServerApache Software Foundation<= 2.4.48NVD

Sources: KEV = CISA Known Exploited Vulnerabilities catalog; NVD = NIST National Vulnerability Database.

Intelligence timeline

Developments from the last 30 days, newest first.

  1. CVSS scoredUpdateKEV

    CVE-2021-40438 scored CVSS 9.0: Apache Apache, Apache HTTP Server-Side Request Forgery (SSRF)

    CISA lists this as exploited in the wild and known to be used in ransomware campaigns. Unpatched Apache systems are exposed to active attacks now.

    Basis: NIST National Vulnerability Database

  2. Patch releasedUpdateKEV

    Patch released for CVE-2021-40438: Apache Apache, Apache HTTP Server-Side Request Forgery (SSRF)

    An official fix is now available for Apache Apache. This vulnerability is being exploited, so apply it promptly.

    Basis: NVD patch reference

1 earlier event is available with a subscription. See plans.

Coverage

We have not published a story about this vulnerability yet.

References

  • nvd.nist.gov https://nvd.nist.gov/vuln/detail/CVE-2021-40438
  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf
  • httpd.apache.org https://httpd.apache.org/security/vulnerabilities_24.html
  • lists.apache.org https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a%40%3Cusers.http…
  • lists.apache.org https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37%40%3Cbugs.httpd…
  • lists.apache.org https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.http…
  • lists.apache.org https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.http…
  • lists.apache.org https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.http…
  • lists.apache.org https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.http…
  • lists.apache.org https://lists.apache.org/thread.html/rf6954e60b1c8e480678ce3d02f61b8a788997785652e9557a3265c00%40%3Cusers.http…
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNAC…
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36F…
  • security.gentoo.org https://security.gentoo.org/glsa/202208-20
  • security.netapp.com https://security.netapp.com/advisory/ntap-20211008-0004/
  • tools.cisco.com https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
  • debian.org https://www.debian.org/security/2021/dsa-4982
  • oracle.com https://www.oracle.com/security-alerts/cpuapr2022.html
  • oracle.com https://www.oracle.com/security-alerts/cpujan2022.html
  • tenable.com https://www.tenable.com/security/tns-2021-17
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40438