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CVE-2021-44228 Apache CVE debrief

CVE-2021-44228 is a high-priority Apache Log4j2 remote code execution vulnerability that CISA added to its Known Exploited Vulnerabilities catalog on 2021-12-10. CISA also marks it as associated with known ransomware campaign use. For affected assets where updates exist, CISA’s required remediation is to apply updates or remove the affected assets from agency networks; temporary mitigations are only acceptable until updates are available.

Vendor
Apache
Product
Log4j2
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-12-10
Original CVE updated
2021-12-10
Advisory published
2021-12-10
Advisory updated
2021-12-10

Who should care

Security teams, system owners, IT operations, and incident responders responsible for Apache Log4j2 deployments or any software that bundles it. Organizations with internet-facing services, logging-heavy application stacks, or asset inventories that include third-party Java applications should treat this as urgent.

Technical summary

The source corpus identifies this as an Apache Log4j2 remote code execution vulnerability and a CISA KEV entry. That means exploitation is known in the wild, and CISA has assigned a remediation deadline of 2021-12-24 for covered federal assets. The supplied source does not include exploit mechanics, so the key defensive takeaway is exposure management: find affected Log4j2 instances, update to a fixed version where available, or remove affected assets if updates cannot be applied.

Defensive priority

Critical — immediate action recommended because the vulnerability is known exploited and tied to known ransomware campaign use.

Recommended defensive actions

  • Inventory all applications, services, and appliances that include Apache Log4j2 or bundle it indirectly.
  • Apply vendor updates to affected software assets as soon as possible where updates exist.
  • If updates are not available, remove affected assets from agency or enterprise networks as a compensating control.
  • Use only temporary mitigations until updates are available, then replace them with permanent remediation.
  • Validate remediation by rescanning assets and confirming no remaining vulnerable Log4j2 instances.
  • Prioritize internet-facing, externally reachable, and business-critical systems first.

Evidence notes

CISA’s KEV source item lists vendorProject Apache, product Log4j2, vulnerabilityName "Apache Log4j2 Remote Code Execution Vulnerability," dateAdded 2021-12-10, dueDate 2021-12-24, and knownRansomwareCampaignUse "Known." The same source states that for affected software assets with updates, only applying updates or removing affected assets are acceptable remediation actions, with temporary mitigations allowed only until updates are available. The published and modified dates supplied for the CVE and source item are both 2021-12-10, and those dates are used here as the CVE timing context.

Official resources

CVE published and source material dated 2021-12-10; CISA KEV entry added on 2021-12-10 with a remediation due date of 2021-12-24. This debrief uses the supplied CVE and source dates only.