CVE-2025-69809: A write-what-where condition in p2r3 Bareiron commit 8e4d40 allows unauthenticated attackers to write arbitrar

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2025-69809 is a critical-severity flaw (CVSS 9.8) affecting bareiron. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A write-what-where condition in p2r3 Bareiron commit 8e4d40 allows unauthenticated attackers to write arbitrary values to memory, enabling arbitrary code execution via a crafted packet.

Why this priority

Critical severity
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	0.5% (top 54%)
CISA exploited list	No
Weakness	CWE-123
Published	2026-03-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: p2r3

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

Am I affected?

Timeline

2026-03-16 19:16 UTCPublished CVE record published
2026-06-17 10:00 UTCUpdated Record last modified

p2r3 bareiron DOWNGRADE

Affected: 2025-09-16

Fixed in: no fixed release known

Safe to downgrade to: a release before 2025-09-16

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2025-09-16 (Debian / Ubuntu)

apt-cache madison bareiron sudo apt install bareiron=<VERSION_BEFORE_2025-09-16> sudo apt-mark hold bareiron

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

dnf --showduplicates list bareiron sudo dnf downgrade bareiron-<VERSION_BEFORE_2025-09-16> sudo dnf versionlock add bareiron

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-2025-69809?

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

Is CVE-2025-69809 being exploited?

CVE-2025-69809 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-2025-69809 affect?

CVE-2025-69809 affects bareiron. Severity is critical (CVSS 9.8). A write-what-where condition in p2r3 Bareiron commit 8e4d40 allows unauthenticated attackers to write arbitrary values to memory, enabling arbitrary code execution via a crafted packet.

How urgent is CVE-2025-69809?

Priority 51/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-69808 CRITICAL 9.1 DOWNGRADE An out-of-bounds memory access (OOB) in p2r3 Bareiron commit 8e4d40 allows unauthenticated attackers to access
CVE-2025-69807 HIGH 7.5 DOWNGRADE p2r3 Bareiron commit: 8e4d4020d is vulnerable to Buffer Overflow, which allows unauthenticated remote attacker
CVE-2025-69806 HIGH 7.5 DOWNGRADE p2r3 bareiron commit: 8e4d4020d contains an Out-of-bounds Read, which allows unauthenticated remote attackers

References

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