CVE-2021-42550

Name: CVE-2021-42550
Creator: NVD / NIST
Published: 2021-12-16T19:15:08.297+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.6/10EPSS 4.44%

Last modified Jun 17, 2026

CVE-2021-42550 is a medium-severity vulnerability rated 6.6/10 on the CVSS scale. 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.. EPSS estimates a 4.44% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.6/10

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

EPSS Probability

4.44%

90.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Qos	Logback	<= 1.2.7	—
Qos	Logback	1.3.0	Alpha0
Redhat	Satellite	6.0	—
Netapp	Cloud Manager	All versions	—
Netapp	Service Level Manager	All versions	—
Netapp	Snap Creator Framework	All versions	—
Siemens	Sinec Nms	< 1.0.3	—

References

http://logback.qos.ch/news.htmlVendor Advisory
http://packetstormsecurity.com/files/167794/Open-Xchange-App-Suite-7.10.x-Cross-Site-Scripting-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2022/Jul/11Mailing List, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-371761.pdfThird Party Advisory
https://github.com/cn-panda/logbackRceDemoExploit, Third Party Advisory
https://jira.qos.ch/browse/LOGBACK-1591Exploit, Issue Tracking, Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20211229-0001/Third Party Advisory
http://logback.qos.ch/news.htmlVendor Advisory
http://packetstormsecurity.com/files/167794/Open-Xchange-App-Suite-7.10.x-Cross-Site-Scripting-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2022/Jul/11Mailing List, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-371761.pdfThird Party Advisory
https://github.com/cn-panda/logbackRceDemoExploit, Third Party Advisory
https://jira.qos.ch/browse/LOGBACK-1591Exploit, Issue Tracking, Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20211229-0001/Third Party Advisory

Timeline

Published: Dec 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42550?

How severe is CVE-2021-42550?

CVE-2021-42550 has a CVSS score of 6.6/10 (MEDIUM severity). The EPSS model estimates a 4.44% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42550?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-42550?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST