CVE-2017-7175: NfSen before 1.3.8 allows remote attackers to execute arbitrary OS commands via shell metacharacters in the cu

Q: How do I fix CVE-2017-7175?

nfsen: upgrade to newer than 1.3.7. Exact commands for each OS are on this page.

Q: Is CVE-2017-7175 being exploited?

CVE-2017-7175 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-2017-7175 affect?

CVE-2017-7175 affects nfsen. Severity is critical (CVSS 9.9). NfSen before 1.3.8 allows remote attackers to execute arbitrary OS commands via shell metacharacters in the customfmt parameter (aka the "Custom output format" field).

Q: How urgent is CVE-2017-7175?

Priority 63/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference

This week

CRITICAL 9.9UPGRADE

CVE-2017-7175 is a critical-severity flaw (CVSS 9.9) affecting nfsen. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NfSen before 1.3.8 allows remote attackers to execute arbitrary OS commands via shell metacharacters in the customfmt parameter (aka the "Custom output format" field).

Why this priority

Critical severity
EPSS top 6%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	6.5% (top 6%)
CISA exploited list	No
Weakness	CWE-78
Published	2017-07-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nfsen

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

Am I affected?

Timeline

2017-07-10 19:29 UTCPublished CVE record published
2026-06-17 01:23 UTCUpdated Record last modified

nfsen nfsen UPGRADE

Affected: <= 1.3.7

Fixed in: newer than 1.3.7

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.3.7 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nfsen

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: NfSen < 1.3.7 / AlienVault OSSIM 4.3.1 - 'customfmt' Command Injection

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-2017-7175?

nfsen: upgrade to newer than 1.3.7. Exact commands for each OS are on this page.

Is CVE-2017-7175 being exploited?

CVE-2017-7175 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-2017-7175 affect?

CVE-2017-7175 affects nfsen. Severity is critical (CVSS 9.9). NfSen before 1.3.8 allows remote attackers to execute arbitrary OS commands via shell metacharacters in the customfmt parameter (aka the "Custom output format" field).

How urgent is CVE-2017-7175?

Priority 63/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2017-6972 CRITICAL 9.8 UPGRADE UPGRADE AlienVault USM and OSSIM before 5.3.7 and NfSen before 1.3.8 have an error in privilege dropping and unnecessa
CVE-2017-6971 HIGH 8.8 UPGRADE UPGRADE AlienVault USM and OSSIM before 5.3.7 and NfSen before 1.3.8 allow remote authenticated users to execute arbit
CVE-2017-6970 HIGH 8.4 UPGRADE UPGRADE AlienVault USM and OSSIM before 5.3.7 and NfSen before 1.3.8 allow local users to execute arbitrary commands i

References

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