CVE-2021-45105
Published: 19 December 2021
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.
Priority
Status
Package | Release | Status |
---|---|---|
apache-log4j2 Launchpad, Ubuntu, Debian |
focal |
Released
(2.17.0-0.20.04.1)
|
hirsute |
Released
(2.17.0-0.21.04.1)
|
|
impish |
Released
(2.17.0-0.21.10.1)
|
|
upstream |
Released
(2.17.0-1)
|
|
bionic |
Released
(2.12.4-0ubuntu0.1)
|
|
jammy |
Not vulnerable
(2.17.0-1)
|
|
kinetic |
Not vulnerable
(2.17.0-1)
|
|
lunar |
Not vulnerable
(2.17.0-1)
|
|
Patches: upstream: https://github.com/apache/logging-log4j2/commit/806023265f8c905b2dd1d81fd2458f64b2ea0b5e (2.x) upstream: https://github.com/apache/logging-log4j2/commit/bf7e916df6335713fe2219c7b3b523fb509deabc (2.12.x) |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 5.9 |
Attack vector | Network |
Attack complexity | High |
Privileges required | None |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | None |
Availability impact | High |
Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
References
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Log4Shell
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-45105
- https://logging.apache.org/log4j/2.x/security.html#CVE-2021-45105
- https://ubuntu.com/security/notices/USN-5203-1
- https://ubuntu.com/security/notices/USN-5222-1
- NVD
- Launchpad
- Debian