Which products and versions are affected by CVE-2016-9565?

Affected: Nagios; nagios3 (debian). The full list is in the CVE brief.

Is CVE-2016-9565 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2016-9565 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2016-9565?

Public exploit code is available.

Is there a fix for CVE-2016-9565?

Fixed versions are available, including Nagios 0:3.5.1-9.el6, Nagios 0:3.5.1-9.el7, Nagios 4.2.1.

How urgently should CVE-2016-9565 be patched?

Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Request A Demo

WatchlistHigh

CVE-2016-9565Nagios Command Injection

nagios: Command injection via curl in MagpieRSS

Published Dec 13, 2016 · Updated Jul 8, 2026 · Also known as DEBIAN-CVE-2016-9565, DLA-751-1, UBUNTU-CVE-2016-9565

Key Facts

Patch immediately

CVE-2016-9565 is a high-severity vulnerability (CVSS 8.1 v3.1) affecting Nagios, nagios3 (debian).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 23% probability of exploitation in the next 30 days.
Fixed versions are available, including Nagios 0:3.5.1-9.el6, Nagios 0:3.5.1-9.el7, Nagios 4.2.1.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Scores

CVSS v3.1

8.1

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

23%

Higher than 97.7% of all scored CVEs

Exploit maturity

Proof of concept

ATLAS score

44/100

Publication score, see How it works

Exploitation Verdict

KEV listed

Not listed

Federal due date

None

No federal due date

Ransomware use

Not reported

Attributed actors

None named

Exploit & Defence Guidance

Exploit maturity

Proof of concept

Public exploit code

Proof-of-concept links

In-the-wild evidence

Reports of active use

Advisories And Exploit References

advisoryhttps://ubuntu.com/security/CVE-2016-9565
advisoryhttps://www.cve.org/CVERecord?id=CVE-2016-9565
advisoryRHSA-2017:0211
advisoryRHSA-2017:0212
advisoryRHSA-2017:0213
advisoryRHSA-2017:0214

Description

MagpieRSS, as used in the front-end component in Nagios Core before 4.2.2 might allow remote attackers to read or write to arbitrary files by spoofing a crafted response from the Nagios RSS feed server. NOTE: this vulnerability exists because of an incomplete fix for CVE-2008-4796.

Affected Products

4 affected entries in total

Product	Affected versions	Fixed in
NagiosNagios	See advisory	4.2.1
nagios3debian	See advisory	3.4.1-3+deb7u3

Patched Releases

Nagios

0:3.5.1-9.el6, 0:3.5.1-9.el7, 4.2.1

nagios3

3.4.1-3+deb7u3

Timeline

Publicly disclosed
Dec 13, 2016
Last updated
Jul 8, 2026

Weakness Type

CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-284 Improper Access Control

References

15 more references in the full CVE brief

FAQ

Common Questions.

MagpieRSS, as used in the front-end component in Nagios Core before 4.2.2 might allow remote attackers to read or write to arbitrary files by spoofing a crafted response from the Nagios RSS feed server.
Affected: Nagios; nagios3 (debian). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Nagios 0:3.5.1-9.el6, Nagios 0:3.5.1-9.el7, Nagios 4.2.1.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Is CVE-2016-9565 On Your Attack Surface?

Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.