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Vulnerability record · CVE-2021-42550 · published 16 December 2021

CVE-2021-42550: Qos logback deserialization of untrusted data vulnerability

Qos · Logback

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.

6.6 CVSS 3.1 Medium EPSS 4.4% · top 8.9% CWE-502 · Deserialization of untrusted data
6.6CVSS 3.1 base score, v2 8.5
4.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
14References, 6 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://logback.qos.ch/news.html Vendor Advisory
http://packetstormsecurity.com/files/167794/Open-Xchange-App-Suite-7.10.x-Cross-Site-Scripting-Command-Injection.html ExploitThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2022/Jul/11 Mailing ListThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-371761.pdf Third Party Advisory
https://github.com/cn-panda/logbackRceDemo ExploitThird Party Advisory
https://jira.qos.ch/browse/LOGBACK-1591 ExploitIssue TrackingPatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20211229-0001/ Third Party Advisory
http://logback.qos.ch/news.html Vendor Advisory
http://packetstormsecurity.com/files/167794/Open-Xchange-App-Suite-7.10.x-Cross-Site-Scripting-Command-Injection.html ExploitThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2022/Jul/11 Mailing ListThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-371761.pdf Third Party Advisory
https://github.com/cn-panda/logbackRceDemo ExploitThird Party Advisory
https://jira.qos.ch/browse/LOGBACK-1591 ExploitIssue TrackingPatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20211229-0001/ Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-42550), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.