CVE-2013-3631: NAS4Free 9.1.0.1.804 and earlier allows remote authenticated users to execute arbitrary PHP code via a request

Q: How do I fix CVE-2013-3631?

nas4free: upgrade to newer than 9.1.0.1.804. Exact commands for each OS are on this page.

Q: Is CVE-2013-3631 being exploited?

CVE-2013-3631 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-2013-3631 affect?

CVE-2013-3631 affects nas4free. Severity is medium (CVSS 6.0). NAS4Free 9.1.0.1.804 and earlier allows remote authenticated users to execute arbitrary PHP code via a request to exec.php, aka the "Advanced | Execute Command" feature. NOTE: this issue might not be a vulnerability, since it appears to be

Q: How urgent is CVE-2013-3631?

Priority 50/100. EPSS top 3%: very likely to be exploited; Public exploit reference

This week

MEDIUM 6.0UPGRADE

CVE-2013-3631 is a medium-severity flaw (CVSS 6.0) affecting nas4free. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NAS4Free 9.1.0.1.804 and earlier allows remote authenticated users to execute arbitrary PHP code via a request to exec.php, aka the "Advanced | Execute Command" feature. NOTE: this issue might not be a vulnerability, since it appears to be part of legitimate, intentionally-exposed functionality by the developer and is allowed within the intended security policy.

Why this priority

EPSS top 3%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.0 (Medium)
EPSS exploit chance	13.7% (top 3%)
CISA exploited list	No
Weakness	CWE-94
Published	2013-11-02
Last modified	2026-06-16

Publisher (CNA): CERT/CC · Vendor: nas4free

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2013-11-02 19:55 UTCPublished CVE record published
2026-06-16 23:55 UTCUpdated Record last modified

nas4free nas4free UPGRADE

Affected: <= 9.1.0.1.804 · 9.1.0.1.798

Fixed in: newer than 9.1.0.1.804

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nas4free || rpm -q nas4free || nas4free --version

2. UPGRADE to newer than 9.1.0.1.804 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nas4free

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nas4free

Note

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

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: NAS4Free - Remote Code Execution (Metasploit)
Metasploit: NAS4Free Arbitrary Remote Code Execution

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-2013-3631?

nas4free: upgrade to newer than 9.1.0.1.804. Exact commands for each OS are on this page.

Is CVE-2013-3631 being exploited?

CVE-2013-3631 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-2013-3631 affect?

CVE-2013-3631 affects nas4free. Severity is medium (CVSS 6.0). NAS4Free 9.1.0.1.804 and earlier allows remote authenticated users to execute arbitrary PHP code via a request to exec.php, aka the "Advanced | Execute Command" feature. NOTE: this issue might not be a vulnerability, since it appears to be

How urgent is CVE-2013-3631?

Priority 50/100. EPSS top 3%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

References

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