CVE-2021-45046 in Apache Log4j2: exploited now
Attackers are exploiting CVE-2021-45046 in Apache Log4j2. CISA has listed it as known exploited since 1 May 2023.
Ransomware groups have used this vulnerability.
| Product | Apache Log4j2 |
|---|---|
| Known exploited since | 1 May 2023 |
| Ransomware use | Recorded |
| EU vulnerability database | EUVD-2021-34769 |
| Sources | NVD · CISA KEV |
What it means
Attackers have used this vulnerability in real attacks. An unpatched Apache Log4j2 that can be reached from the internet is exposed to them.
What to do
- Find every system running Apache Log4j2, starting with those reachable from the internet.
- Apply the vendor's fix, or take the system off the internet until you can.
- Check the system for signs that it was reached before the fix.
How Vardion finds it
Wherever a scan or your imported scanner results find CVE-2021-45046, Vardion names the systems affected and puts the fix at the top of the list.
Know before an attacker does
Vardion checks your servers, websites, domains and leaked staff accounts on the schedule you set and tells you what to fix first, in plain words.
From CISA's known exploited vulnerabilities catalogue as it stood on 4 October 2026.