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No exploitation reportedFix available

CVE-2021-42550

No exploitation reported by the sources we read.

  • Published2021-12-16
  • WeaknessCWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-12-1619:15CVE publishedNVD

Versions per branch

NVD
Qos logback
BranchAffectedFixed in
1.2≤ 1.2.7no fix published
1.3= 1.3.0no fix published
Netapp cloud manager
BranchAffectedFixed in
—all versionsno fix published
Netapp service level manager
BranchAffectedFixed in
—all versionsno fix published

4 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • antlr3openSUSE:Leap 15.4all versions · fixed in 3.5.3-150200.3.11.8and 2 other packages
  • antlr3-javaSUSE:Manager Server Module 4.3all versions · fixed in 3.5.3-150200.3.11.8
  • candlepinRed Hat:satellite:6.11::el8all versions · fixed in 0:4.1.13-1.el8sat
  • candlepinRed Hat:satellite:6.11::el7all versions · fixed in 0:4.1.13-1.el7sat
  • ch.qos.logback:logback-coreRoot:Mavenall versions · fixed in 1.1.3-aikido.3
  • ch.qos.logback:logback-coreRoot:Mavenall versions · fixed in 1.0.12-aikido.1
  • ch.qos.logback:logback-coreRoot:Mavenall versions · fixed in 1.2.9-aikido.2
  • ch.qos.logback:logback-coreRoot:Mavenall versions · fixed in 1.2.9-aikido.3

108 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-42550 Red Hat Product Security7 products fixed · 4 known affected

    logback: remote code execution through JNDI call from within its configuration file

    logback-classic as a component of Red Hat BPM Suite 6 · logback-classic as a component of Red Hat Integration Camel K 1 · logback-classic as a component of Red Hat JBoss BRMS 6 · +1 more

  • ICSA-22-314-03 CISA1 known affected

    Siemens SINEC Network Management System Logback Component

    SINEC NMS

  • SSA-371761 Siemens ProductCERT1 known affected

    SSA-371761: Arbitrary Code Execution Vulnerability in the Logback Component of SINEC NMS before V1.0.3

    SINEC NMS

  • RHSA-2022:5532 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Fuse 7.11.0 release and security update

  • RHSA-2022:5498 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Satellite 6.11 Release

  • RHSA-2022:1110 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Decision Manager 7.12.1 security update

1 more advisory

Full record on NVD

Fix

  1. Vendor fix CISA ICSA-22-314-03 · 1 productUpdate to V1.0.3 or later version
  2. Vendor fix Siemens ProductCERT SSA-371761 · 1 productUpdate to V1.0.3 or later version
  3. Vendor fix Red Hat Product Security RHSA-2022:5532 · 1 productBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on. Installation instructions are available from the Fuse 7.11.0 product documentation page: https://access.redhat.com/documentation/en-us/red_ha…
  4. Vendor fix Red Hat Product Security RHSA-2022:5498 · 4 productsFor Red Hat Satellite 6.11 see the following documentation for the release. https://access.redhat.com/documentation/en-us/red_hat_satellite/6.11 The important instructions on how to upgrade are available below. https://access.redhat.com/documentation/en-us/red_hat_satellite/6.11/html/upgrading_and…
  5. Vendor fix Red Hat Product Security RHSA-2022:1110 · 1 productFor on-premise installations, before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on. It is recommended to halt the server by stopping the JBoss Application Server process before installing this up…
  6. Mitigation from the vendor CISA ICSA-22-314-03 · 1 productRestrict the write access to the logback configuration file ( logback.xml) to trusted personnel

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.16.6known since 2026-10-23
  • NVDCVSS 3.16.6read 2026-10-23
  • NVDCVSS 2.08.5read 2026-10-23
  • CNAweakness (CWE)CWE-502known since 2026-10-23
  • NVDweakness (CWE)CWE-502read 2026-10-23
  • FIRST EPSSEPSS score4.8 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2021-12-17

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Published
2021-12-16
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-668q-qrv7-99fm

Frequently asked questions

What is CVE-2021-42550?

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.

Is CVE-2021-42550 actively exploited?

Active exploitation of CVE-2021-42550 has not been confirmed. Its EPSS score was 4.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-42550?

CVE-2021-42550 has a CVSS v3 base score of 6.6 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

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