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CVE-2021-44228 affects Apache Log4j 2.
It is known as Log4Shell.
The flaw lives in message lookup substitution.
Log4j evaluates ${…} patterns in log messages.
An attacker can inject a JNDI lookup string.
The string can point to an LDAP server.
The server is controlled by the attacker.
When the string is logged, Log4j resolves it.
JNDI connects to the attacker’s LDAP endpoint.
The LDAP response references a Java class.
Log4j may load and execute that class.
This happens without authentication.
The attacker only needs a logged input.
Common inputs include headers and parameters.
User-Agent is a classic vector.
X-Api-Version can also work.
Any field written to logs may trigger it.
The lookup uses the jndi: scheme.
LDAP, RMI, DNS, and other protocols may be abused.
DNS can confirm out-of-band execution.
LDAP can deliver a remote class payload.
The payload runs with the JVM privileges.
That often means full application compromise.
The vulnerability is network exploitable.
It requires no user interaction.
It can lead to remote code execution.
It can leak secrets and environment data.
It can install persistence or pivot.
It is critical because of broad Log4j use.
Patches and mitigations are widely available.
DailyCVE Form:
Platform: Apache Log4j
Version: 2.0-beta9–2.14.1
Vulnerability: JNDI lookup RCE
Severity: Critical
date: 2021-12-10
Prediction: 2021-12-10
What Undercode Say:
Analytics:
curl -s https://pocindex.io/CVE_list.json \
| jq '.[] | select(.cve == "CVE-2021-44228") | {cve, poc: (.poc | length), nuclei, msf, edb, vulhub, collections}'
curl -s https://pocindex.io/cve_metadata.json | jq '."CVE-2021-44228"'
curl -s https://pocindex.io/epss.json | jq '."CVE-2021-44228"'
curl -s https://pocindex.io/repo_meta.json | jq '."sfewer-r7/cve-2026-55040"'
curl -s https://pocindex.io/kev.json -o kev.json
curl -s https://pocindex.io/epss.json -o epss.json
jq -n --slurpfile kev kev.json --slurpfile epss epss.json \
'[$kev[bash] | keys[] | select($epss[bash][.]) | {cve: ., epss: $epss[bash][.][bash]}]
| sort_by(-.epss) | .[:10]'
Exploit: (Educational Purposes!)
curl -s https://pocindex.io/CVE_list.json | jq '.[] | select(.cve == "CVE-2021-44228") | {poc, nuclei, msf, edb, vulhub}'
curl -s https://pocindex.io/nuclei.json | jq '."CVE-2021-44228"'
curl -s https://pocindex.io/cves/2021/CVE-2021-44228.md
Protection: from this CVE
java -Dlog4j2.formatMsgNoLookups=true -jar app.jar zip -q -d log4j-core-.jar org/apache/logging/log4j/core/lookup/JndiLookup.class
Impact:
Unauthenticated remote code execution.
Full application compromise.
Data theft.
Lateral movement.
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Sources:
Reported By: github.com
Extra Source Hub:
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