CVE-2024-38921: Open Robotics Robotic Operating System 2 (ROS2) and Nav2 humble versions were discovered to contain a use-afte

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2024-38921 is a critical-severity flaw (CVSS 9.8) affecting robot operating system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Open Robotics Robotic Operating System 2 (ROS2) and Nav2 humble versions were discovered to contain a use-after-free via the nav2_amcl process. This vulnerability is triggered via remotely sending a request for change the value of dynamic-parameter`/amcl z_rand ` .

Why this priority

Critical severity
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	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-416
Published	2024-12-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: openrobotics

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

Am I affected?

Timeline

2024-12-06 22:15 UTCPublished CVE record published
2026-06-17 07:41 UTCUpdated Record last modified

openrobotics robot operating system DOWNGRADE

Affected: 2 humble · 2 iron

Fixed in: no fixed release known

Safe to downgrade to: a release before 2

1. Check installed version

apt-cache policy robot-operating-system || rpm -q robot-operating-system || robot-operating-system --version

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

apt-cache madison robot-operating-system sudo apt install robot-operating-system=<VERSION_BEFORE_2> sudo apt-mark hold robot-operating-system

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

dnf --showduplicates list robot-operating-system sudo dnf downgrade robot-operating-system-<VERSION_BEFORE_2> sudo dnf versionlock add robot-operating-system

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-2024-38921?

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

Is CVE-2024-38921 being exploited?

CVE-2024-38921 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-2024-38921 affect?

CVE-2024-38921 affects robot operating system. Severity is critical (CVSS 9.8). Open Robotics Robotic Operating System 2 (ROS2) and Nav2 humble versions were discovered to contain a use-after-free via the nav2_amcl process. This vulnerability is triggered via remotely sending a request for change the value of dynamic-p

How urgent is CVE-2024-38921?

Priority 56/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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