CVE Intel / CVE-2021-44228

CVE-2021-44228

6bk1602-0aa12-0tp0 · apache, apple, bentley, cisco, debian, fedoraproject, intel, netapp, percussion, siemens, snowsoftware, sonicwall

⚠

Actively exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalogue: exploitation confirmed in the wild. Patch on priority.

Patch now

This CVE is being exploited. Apply the vendor fix, or take the service off the internet until you can, then check your logs for attempts.

Watch this productFree email alerts

CISA KEVexploited on our sensorsCritical CVSS 10.0network detectablepublic exploit: ExploitDB, Metasploit

What it is

Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled. From log4j 2.15.0, this behavior has been disabled by default. From version 2.16.0 (along with 2.12.2, 2.12.3, and 2.3.1), this functionality has been completely removed. Note that this vulnerability is specific to log4j-core and does not affect log4net, log4cxx, or other Apache Logging Services projects.

Live exploitation on the huntback network (30 days)

attempts captured

distinct source IPs

2026-11-04

last seen

Detection

huntback carries a network signature for this CVE. Exploitation attempts are detected on the decoy fleet in real time.

ExploitDBExploit code published (ExploitDB)

MetasploitExploit code published (Metasploit)

NucleiNuclei detection template available

Evidence

Confirmed exploited. Our decoys saw 1 exploitation attempt in the last 14 days; CISA added it to KEV 1798 days ago.

2026-11-04Observed · huntback decoys
Last attempt. 6 attempts on our decoys, 1 in the last 14 days

2026-09-15Observed · huntback decoys
First exploitation attempt on our decoys

2021-12-10Context · CVE record
Published

2021-12-10Reported · CISA KEV
Added to CISA Known Exploited Vulnerabilities

undatedWeaponised · ExploitDB
Exploit code published (ExploitDB)

undatedWeaponised · Metasploit
Exploit code published (Metasploit)

undatedWeaponised · Nuclei
Nuclei detection template available

Observed: our own decoys saw it. Reported: CISA, the vendor or another named source says so. Weaponised: public exploit code or a scanner template exists. Methodology

Questions

Is CVE-2021-44228 being exploited in the wild?

Yes. The huntback decoy network captured 6 exploitation attempts from 3 distinct source IPs; the most recent was on 2026-11-04. It is also in the CISA KEV catalogue.

Can CVE-2021-44228 be detected on the network?

Yes. huntback carries a network signature for CVE-2021-44228, so attempts against a decoy are tagged in real time.

How huntback helps

Deploy a decoy that emulates 6bk1602-0aa12-0tp0 and you will see every attempt at this CVE the moment it lands, with the full payload, the attacker's infrastructure, and any stage-2 loader. Then huntback can scan the attacker back.

CVSS10.0 Critical

EPSS1.00 (99% pct)

In CISA KEVyes

Published2021-12-10

Updated2026-08-11

Network detectableyes, signatured

Public exploitExploitDB, Metasploit

NVD record → Browse all CVEs → Live malware and C2 finds → Novel-attack discovery → Deploy a decoy →

API

This record, with its evidence timeline, as JSON:

curl -H "X-API-Key: $HUNTBACK_KEY" https://app.huntback.io/api/v1/evidence/CVE-2021-44228

Get a free API key →