CVE-2020-6855: A large or infinite loop vulnerability in the JOC Cockpit component of SOS JobScheduler 1.11 and 1.13.2 allows

Routine

MEDIUM 6.5DOWNGRADE

CVE-2020-6855 is a medium-severity flaw (CVSS 6.5) affecting jobscheduler. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A large or infinite loop vulnerability in the JOC Cockpit component of SOS JobScheduler 1.11 and 1.13.2 allows attackers to parameterize housekeeping jobs in a way that exhausts system resources and results in a denial of service.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-835
Published	2020-02-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sos-berlin

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

Am I affected?

Timeline

2020-02-06 17:15 UTCPublished CVE record published
2026-06-17 03:23 UTCUpdated Record last modified

sos-berlin jobscheduler DOWNGRADE

Affected: 1.11 · 1.13.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.11

1. Check installed version

apt-cache policy jobscheduler || rpm -q jobscheduler || jobscheduler --version

2. No fixed release: DOWNGRADE to a release before 1.11 (Debian / Ubuntu)

apt-cache madison jobscheduler sudo apt install jobscheduler=<VERSION_BEFORE_1.11> sudo apt-mark hold jobscheduler

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jobscheduler sudo dnf downgrade jobscheduler-<VERSION_BEFORE_1.11> sudo dnf versionlock add jobscheduler

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.

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-2020-6855?

jobscheduler: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-6855 being exploited?

CVE-2020-6855 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-2020-6855 affect?

CVE-2020-6855 affects jobscheduler. Severity is medium (CVSS 6.5). A large or infinite loop vulnerability in the JOC Cockpit component of SOS JobScheduler 1.11 and 1.13.2 allows attackers to parameterize housekeeping jobs in a way that exhausts system resources and results in a denial of service.

How urgent is CVE-2020-6855?

Priority 38/100. No elevated risk signals yet.

Related CVEs

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CVE-2020-6856 MEDIUM 6.5 DOWNGRADE An XML External Entity (XEE) vulnerability exists in the JOC Cockpit component of SOS JobScheduler 1.12 and 1.
CVE-2020-6854 MEDIUM 5.4 DOWNGRADE A cross-site scripting (XSS) vulnerability in the JOC Cockpit component of SOS JobScheduler 1.11 and 1.13.2 al
CVE-2020-12712 HIGH 7.5 UPGRADE A vulnerability based on insecure user/password encryption in the JOE (job editor) component of SOS JobSchedul
CVE-2014-5393 MEDIUM 4.0 UPGRADE Directory traversal vulnerability in the JobScheduler Operations Center (JOC) in SOS JobScheduler before 1.6.4

References

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