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CVE-2021-42550: In logback version 1.2.7 and prior versions, an attacker with the required privileges to edit configurations f

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MEDIUM 6.6WATCHLISTUPGRADEDOWNGRADEMITIGATE

CVE-2021-42550 is a medium-severity flaw (CVSS 6.6) affecting logback, satellite, cloud manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • EPSS top 8%: very likely to be exploited
  • Public exploit reference
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score6.6 (Medium)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededHigh
User interactionNone
EPSS exploit chance4.8% (top 8%)
CISA exploited listNo
WeaknessCWE-502
Published2021-12-16
Last modified2026-06-17
Publisher (CNA): Switzerland Government Common Vulnerability Program · Vendor: netapp · qos · redhat · siemens

Share: LinkedIn · X · Reddit

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

qos logback UPGRADE
Affected: <= 1.2.7 · 1.3.0 alpha0 · 1.3.0 alpha1 · 1.3.0 alpha10 · 1.3.0 alpha2 · 1.3.0 alpha3 · 1.3.0 alpha4 · 1.3.0 alpha5
Fixed in: newer than 1.2.7
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy logback || rpm -q logback || logback --version
2. UPGRADE to newer than 1.2.7 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade logback
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade logback
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
redhat satellite DOWNGRADE
Affected: 6.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.0
1. Check installed version
apt-cache policy satellite || rpm -q satellite || satellite --version
2. No fixed release: DOWNGRADE to a release before 6.0 (Debian / Ubuntu)
apt-cache madison satellite sudo apt install satellite=<VERSION_BEFORE_6.0> sudo apt-mark hold satellite
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list satellite sudo dnf downgrade satellite-<VERSION_BEFORE_6.0> sudo dnf versionlock add satellite
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
netapp cloud manager MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy cloud-manager || rpm -q cloud-manager || cloud-manager --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
netapp service level manager MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy service-level-manager || rpm -q service-level-manager || service-level-manager --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
netapp snap creator framework MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy snap-creator-framework || rpm -q snap-creator-framework || snap-creator-framework --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
siemens sinec nms UPGRADE
Affected: < 1.0.3
Fixed in: 1.0.3
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy sinec-nms || rpm -q sinec-nms || sinec-nms --version
2. UPGRADE to 1.0.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade sinec-nms
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade sinec-nms
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-42550?

logback: upgrade to newer than 1.2.7; satellite: downgrade or apply the listed mitigation; cloud manager: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-42550 being exploited?

CVE-2021-42550 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-42550 affect?

CVE-2021-42550 affects logback, satellite, cloud manager. Severity is medium (CVSS 6.6). 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.

How urgent is CVE-2021-42550?

Priority 56/100. EPSS top 8%: very likely to be exploited; Public exploit reference; On your watchlist

Software pages

Siemens vulnerabilities

Related CVEs

References

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