Vulnerability

CVE-2021-44228

Critical· 10.0KEVEXPLOITCVSS10EPSS94%

.rules3/5

Apache Log4j2 Remote Code Execution Vulnerability

Apache Log4j2 contains a vulnerability where JNDI features do not protect against attacker-controlled JNDI-related endpoints, allowing for remote code execution.

Threat signal

100/100

Severe

Severity

critical

CVSS

10.0

EPSS

94%

Active

KEV

CISA KEV — actively exploited

Ransomware: Known1632d overdue

AffectedApache — Log4j2

Added to KEV

2021-12-10

Federal patch due (BOD 22-01)

2021-12-24

Required action (CISA verbatim)

For all affected software assets for which updates exist, the only acceptable remediation actions are: 1) Apply updates; OR 2) remove affected assets from agency networks. Temporary mitigations using one of the measures provided at https://www.cisa.gov/uscert/ed-22-02-apache-log4j-recommended-mitigation-measures are only acceptable until updates are available.

Vendor advisory + references

https://nvd.nist.gov/vuln/detail/CVE-2021-44228

CISA description: “Apache Log4j2 contains a vulnerability where JNDI features do not protect against attacker-controlled JNDI-related endpoints, allowing for remote code execution.”

CVSS

v3.1Open in FIRST calculator →

10.0/ 10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionNoneFully automated — no victim action needed.
ScopeChangedImpact extends beyond the vulnerable component (e.g. sandbox escape).
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

94.4%

probability of exploitation in next 30 days

p100

higher than 100% of all CVEs

3-day trend↑ 0pp

Statistically about to be weaponized — top-tier triage urgency.

Vendor VEX

No VEX statements published for CVE-2021-44228. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCAct

Active exploitation with total impact on essential/support systems

exploitation: active
automatable: yes
impact: total
mission: support

Lifecycle

2021-12-10Added to CISA KEVransomware: Known
2021-12-10Public exploit observedexploitdb, metasploit
2021-12-10Published
2021-12-18Vendor advisory · amazon-linuxAL2-ALAS2CORRETTO8-2021-001-(critical):-java-1.8.0-ama — ALAS2CORRETTO8-2021-001 (critical): java-1.8.0-amazon-corretto
2021-12-18Vendor advisory · amazon-linuxAL2-ALAS2JAVA-OPENJDK11-2021-001-(critical):-java-11-o — ALAS2JAVA-OPENJDK11-2021-001 (critical): java-11-openjdk
2021-12-23Vendor advisory · amazon-linuxALAS2-2021-1732 — ALAS2-2021-1732 (important): log4j-cve-2021-44228-hotpatch
2021-12-24Federal patch due (BOD 22-01)
2022-04-19Vendor advisory · amazon-linuxALAS2-2022-1773 — ALAS2-2022-1773 (important): log4j-cve-2021-44228-hotpatch
2022-06-15Vendor advisory · amazon-linuxALAS2-2022-1806 — ALAS2-2022-1806 (important): log4j-cve-2021-44228-hotpatch
2026-06-12Last modified1 source

Entity graph

7 nodes · 6 edges · click to pivot

CVEActorVendor advisoryIOCNews

Vendor advisories

Mentions in news & research

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.