CVE-2025-7209: A vulnerability has been found in 9fans plan9port up to 9da5b44 and classified as problematic

Q: How do I fix CVE-2025-7209?

plan9port: upgrade to newer than 2025-03-29. Exact commands for each OS are on this page.

Q: Is CVE-2025-7209 being exploited?

CVE-2025-7209 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-7209 affect?

CVE-2025-7209 affects plan9port. Severity is low (CVSS 3.3). A vulnerability has been found in 9fans plan9port up to 9da5b44 and classified as problematic. Affected by this vulnerability is the function value_decode in the library src/libsec/port/x509.c. The manipulation leads to null pointer derefer

Q: How urgent is CVE-2025-7209?

Priority 20/100. Public exploit reference

Routine

LOW 3.3UPGRADE

CVE-2025-7209 is a low-severity flaw (CVSS 3.3) affecting plan9port. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been found in 9fans plan9port up to 9da5b44 and classified as problematic. Affected by this vulnerability is the function value_decode in the library src/libsec/port/x509.c. The manipulation leads to null pointer dereference. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used. This product takes the approach of rolling releases to provide continious delivery. Therefor

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-404, CWE-476
Published	2025-07-09
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: 9fans

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

Am I affected?

Timeline

2025-07-09 01:15 UTCPublished CVE record published
2026-06-17 10:04 UTCUpdated Record last modified

9fans plan9port UPGRADE

Affected: <= 2025-03-29

Fixed in: newer than 2025-03-29

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy plan9port || rpm -q plan9port || plan9port --version

2. UPGRADE to newer than 2025-03-29 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade plan9port

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade plan9port

Note

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

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-2025-7209?

plan9port: upgrade to newer than 2025-03-29. Exact commands for each OS are on this page.

Is CVE-2025-7209 being exploited?

CVE-2025-7209 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-2025-7209 affect?

CVE-2025-7209 affects plan9port. Severity is low (CVSS 3.3). A vulnerability has been found in 9fans plan9port up to 9da5b44 and classified as problematic. Affected by this vulnerability is the function value_decode in the library src/libsec/port/x509.c. The manipulation leads to null pointer derefer

How urgent is CVE-2025-7209?

Priority 20/100. Public exploit reference

Related CVEs

CVE-2025-7208 MEDIUM 5.5 UPGRADE A vulnerability was found in 9fans plan9port up to 9da5b44

References

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