Risk Letters

Exploited vulnerability

CVE-2021-40438

TLP:CLEAR

Apache HTTP Server-Side Request Forgery (SSRF)

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.

Facts

  • Vendor: Apache
  • Product: Apache
  • CVSS: 9
  • EPSS (probability of exploitation within 30 days): 100 %
  • On CISA's Known Exploited Vulnerabilities list since: 1 December 2021
  • First known exploitation: 1 December 2021
  • Used in ransomware campaigns (per CISA): Yes
  • CISA's deadline for US federal agencies: 15 December 2021
  • Weakness: CWE-918
  • First seen by Risk Letters: 1 December 2021

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Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD