Security News > 2021 > December > Researchers release 'vaccine' for critical Log4Shell vulnerability
Researchers from cybersecurity firm Cybereason has released a "Vaccine" that can be used to remotely mitigate the critical 'Log4Shell' Apache Log4j code execution vulnerability running rampant through the Internet.
Early this morning, researchers released a proof-of-concept exploit for a zero-day remote code execution vulnerability in Apache Log4j tracked as CVE-2021-44228 and dubbed 'Log4Shell.
While Apache quickly released Log4j 2.15.0 to resolve the vulnerability, the vulnerability is trivial to exploit, and cybersecurity firms and researchers quickly saw attackers scan and attempt to compromise vulnerable devices.
Friday evening, cybersecurity firm Cybereason released a script, or "Vaccine," that exploits the vulnerability to turn off a setting in remote, vulnerable Log4Shell instance.
Basically, the vaccine fixes the vulnerability by exploiting the vulnerable server.
There is also concern that security researchers may use the vulnerability to remotely fix servers, even though doing something like this is considered illegal.
News URL
Related news
- Microsoft Patches Critical Azure AI Face Service Vulnerability with CVSS 9.9 Score (source)
- Researchers Find New Exploit Bypassing Patched NVIDIA Container Toolkit Vulnerability (source)
- Elastic Releases Urgent Fix for Critical Kibana Vulnerability Enabling Remote Code Execution (source)
- Moxa Issues Fix for Critical Authentication Bypass Vulnerability in PT Switches (source)
- Critical PHP RCE vulnerability mass exploited in new attacks (source)
- New Critical AMI BMC Vulnerability Enables Remote Server Takeover and Bricking (source)
- IBM scores perfect 10 ... vulnerability in mission-critical OS AIX (source)
- Critical Veeam Backup & Replication RCE vulnerability fixed, patch ASAP! (CVE-2025-23120) (source)
- Infoseccers criticize Veeam over critical RCE vulnerability and a failing blacklist (source)
- Critical Next.js Vulnerability Allows Attackers to Bypass Middleware Authorization Checks (source)
Related Vulnerability
| DATE | CVE | VULNERABILITY TITLE | RISK |
|---|---|---|---|
| 2021-12-10 | CVE-2021-44228 | 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. network low complexity apache siemens intel debian fedoraproject sonicwall netapp cisco snowsoftware bentley percussion apple critical | 10.0 |