CVE-2021-42550

MEDIUM6.6EPSS 2.7%

Deserialization of Untrusted Data in logback

Published: 12/17/2021Modified: 4/28/2026

Description

In logback version 1.2.7 and prior versions, an attacker with the required privileges to edit configurations files could craft a malicious configuration allowing to execute arbitrary code loaded from LDAP servers.

Affected packages (2)

Debian/logbackfrom 0
Maven/ch.qos.logback:logback-corefrom 0, < 1.2.9

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM6.6	CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

References (13)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-42550
ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-42550
PATCHhttps://github.com/qos-ch/logback
WEBhttp://logback.qos.ch/news.html
WEBhttp://packetstormsecurity.com/files/167794/Open-Xchange-App-Suite-7.10.x-Cross-Site-Scripting-Command-Injection.html
WEBhttps://cert-portal.siemens.com/productcert/pdf/ssa-371761.pdf
WEBhttp://seclists.org/fulldisclosure/2022/Jul/11
WEBhttps://github.com/cn-panda/logbackRceDemo
WEBhttps://github.com/qos-ch/logback/blob/1502cba4c1dfd135b2e715bc0cf80c0045d4d128/logback-site/src/site/pages/news.html
WEBhttps://github.com/qos-ch/logback/commit/87291079a1de9369ac67e20dc70a8fdc7cc4359c
WEBhttps://github.com/qos-ch/logback/commit/ef4fc4186b74b45ce80d86833820106ff27edd42
WEBhttps://jira.qos.ch/browse/LOGBACK-1591
WEBhttps://security.netapp.com/advisory/ntap-20211229-0001