CVE-2019-20329: OpenLambda 2019-09-10 allows DNS rebinding attacks against the OL server for the REST API on TCP port 5000.

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HIGH 8.1DOWNGRADE

CVE-2019-20329 is a high-severity flaw (CVSS 8.1) affecting openlambda. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenLambda 2019-09-10 allows DNS rebinding attacks against the OL server for the REST API on TCP port 5000.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-346
Published	2020-01-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: openlambda project

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

Am I affected?

Timeline

2020-01-03 00:15 UTCPublished CVE record published
2026-06-17 02:30 UTCUpdated Record last modified

openlambda project openlambda DOWNGRADE

Affected: 2019-09-10

Fixed in: no fixed release known

Safe to downgrade to: a release before 2019-09-10

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2019-09-10 (Debian / Ubuntu)

apt-cache madison openlambda sudo apt install openlambda=<VERSION_BEFORE_2019-09-10> sudo apt-mark hold openlambda

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

dnf --showduplicates list openlambda sudo dnf downgrade openlambda-<VERSION_BEFORE_2019-09-10> sudo dnf versionlock add openlambda

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-2019-20329?

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

Is CVE-2019-20329 being exploited?

CVE-2019-20329 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-2019-20329 affect?

CVE-2019-20329 affects openlambda. Severity is high (CVSS 8.1). OpenLambda 2019-09-10 allows DNS rebinding attacks against the OL server for the REST API on TCP port 5000.

How urgent is CVE-2019-20329?

Priority 46/100. High severity; Public exploit reference

References

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