CVE-2025-47868: Out-of-bounds Write resulting in possible Heap-based Buffer Overflow vulnerability was discovered in tools/bdf

This month

CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2025-47868 is a critical-severity flaw (CVSS 9.8) affecting nuttx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Out-of-bounds Write resulting in possible Heap-based Buffer Overflow vulnerability was discovered in tools/bdf-converter font conversion utility that is part of Apache NuttX RTOS repository. This standalone program is optional and neither part of NuttX RTOS nor Applications runtime, but active bdf-converter users may be affected when this tool is exposed to external provided user data data (i.e. publicly available automation). This issue affects

Why this priority

Critical severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-122, CWE-787
Published	2025-06-16
Last modified	2026-06-17

Publisher (CNA): Apache Software Foundation · Vendor: apache

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

Am I affected?

Timeline

2025-06-16 11:15 UTCPublished CVE record published
2026-06-17 09:28 UTCUpdated Record last modified

apache nuttx UPGRADE

Affected: >= 6.9 and < 12.9.0

Fixed in: 12.9.0

Safe to downgrade to: a release before 6.9

1. Check installed version

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

2. UPGRADE to 12.9.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nuttx

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nuttx

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.9 (Debian / Ubuntu)

apt-cache madison nuttx sudo apt install nuttx=<VERSION_BEFORE_6.9> sudo apt-mark hold nuttx

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nuttx sudo dnf downgrade nuttx-<VERSION_BEFORE_6.9> sudo dnf versionlock add nuttx

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-2025-47868?

nuttx: upgrade to 12.9.0. Exact commands for each OS are on this page.

Is CVE-2025-47868 being exploited?

CVE-2025-47868 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-2025-47868 affect?

CVE-2025-47868 affects nuttx. Severity is critical (CVSS 9.8). Out-of-bounds Write resulting in possible Heap-based Buffer Overflow vulnerability was discovered in tools/bdf-converter font conversion utility that is part of Apache NuttX RTOS repository. This standalone program is optional and neither p

How urgent is CVE-2025-47868?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

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References

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