CVE-2021-45105
apache-log4j2 - security update
8.6
HIGH
CVSS 3.1
EPSS 74.0%
Description
Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3 and 2.3.1) did not protect from uncontrolled recursion from self-referential lookups. This allows an attacker with control over Thread Context Map data to cause a denial of service when a crafted string is interpreted. This issue was fixed in Log4j 2.17.0, 2.12.3, and 2.3.1.
How to fix CVE-2021-45105
To remediate CVE-2021-45105, upgrade the affected package to a fixed version below.
- —upgrade to 2.17.0-1~deb11u1 or later
- —upgrade to 2.17.0-1~deb10u1 or later
- —upgrade to 2.12.3 or later
- —upgrade to 1.9.2 or later
Is CVE-2021-45105 being exploited?
Likely — EPSS is 74.0%, placing CVE-2021-45105 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (4)
- from 0, < 2.17.0-1~deb11u1
- from 0, < 2.17.0-1~deb10u1
- >= 2.4.0, < 2.12.3
- >= 1.8.0, < 1.9.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |