CVE-2020-29311: Ubilling v1.0.9 allows Remote Command Execution as Root user by executing a malicious command that is injected

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-29311 is a critical-severity flaw (CVSS 9.8) affecting ubilling. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Ubilling v1.0.9 allows Remote Command Execution as Root user by executing a malicious command that is injected inside the config file and being triggered by another part of the software.

Why this priority

Critical severity
EPSS top 6%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	6.6% (top 6%)
CISA exploited list	No
Weakness	CWE-78, CWE-306
Published	2020-12-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ubilling

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

Am I affected?

Timeline

2020-12-10 23:15 UTCPublished CVE record published
2026-06-17 03:11 UTCUpdated Record last modified

ubilling ubilling DOWNGRADE

Affected: 1.0.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.9

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.9 (Debian / Ubuntu)

apt-cache madison ubilling sudo apt install ubilling=<VERSION_BEFORE_1.0.9> sudo apt-mark hold ubilling

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

dnf --showduplicates list ubilling sudo dnf downgrade ubilling-<VERSION_BEFORE_1.0.9> sudo dnf versionlock add ubilling

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-2020-29311?

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

Is CVE-2020-29311 being exploited?

CVE-2020-29311 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-2020-29311 affect?

CVE-2020-29311 affects ubilling. Severity is critical (CVSS 9.8). Ubilling v1.0.9 allows Remote Command Execution as Root user by executing a malicious command that is injected inside the config file and being triggered by another part of the software.

How urgent is CVE-2020-29311?

Priority 68/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-1000827 CRITICAL 9.8 UPGRADE Ubilling version <= 0.9.2 contains a Other/Unknown vulnerability in user-controlled parameter that can result

References

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