CVE Tools
Sign in

CVE-2021-44228

Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints

Published: Dec 10, 2021Updated: Feb 20, 2026 Sources: CVE List NVD GHSA BDU csafCWE-20
NVD MITRE
10.0CVSSCRITICAL
EPSS Score
100.0%
Top 0.0%
CISA KEV
Active Exploitation
Since Dec 10, 2021
Exploits
23 Known
Remediation
Patch Available
Am I actually vulnerable?51 Nuclei templates available — see how to check your systems. How to verify

Description

This CSAF advisory was extracted from unstructured data and may contain inaccuracies. If you notice any errors, please reach out to the designated contact at CISA CSAF: central@cisa.dhs.gov

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-20CWE-400CWE-502CWE-917

Affected Products

Cisco Identity Services EngineCisco Systems Inc.
On-premSecurity Product
Networking Infrastructure
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
Cisco Registered Envelope ServiceCisco Systems Inc.
On-prem
Networking Infrastructure / router-switch
Cisco UmbrellaCisco Systems Inc.
On-prem
Networking Infrastructure / router-switch
LOGO! Soft ComfortSiemens AG
On-prem
Enterprise Software / collaboration-groupware
cisco systems inc.commercialUSNetworking Infrastructureaka cisco systems, cisco
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
siemens agcommercialDEEnterprise Softwareaka siemens
and 254 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Dec 10, 2021
Remediation due:Dec 24, 2021
Ransomware:Known ransomware use

Required action: 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.

23 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Workaround Available

MITRE ATT&CK

4 techniques
Execution
Impact
Initial Access
View detailed technique mapping

References

https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2022/icsa-22-034-01.json
raw.githubusercontent.com
https://www.cisa.gov/news-events/ics-advisories/icsa-22-034-01
cisa.gov
https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
cisa.gov
and 99 more references View all →

Timeline

Published
Dec 10, 2021
Added to CISA KEV
Dec 10, 2021
Last Updated
Feb 20, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2021-44228 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows