HOMEVULNERABILITIESCVE-2020-28907
CRITICAL

CVE-2020-28907

CWE-295Published: May 24, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

Incorrect SSL certificate validation in Nagios Fusion 4.1.8 and earlier allows for Escalation of Privileges or Code Execution as root via vectors related to download of an untrusted update package in upgrade_to_latest.sh.

NVD Source

Technical Analysis

CVE-2020-28907 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

nagios1 product(s)
fusion
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://packetstormsecurity.com/files/162783/Nagios-XI-Fusion-Privilege-Escalation-Cross-Site-Scripting-Code-Execution.html
ADVISORYhttps://skylightcyber.com/2021/05/20/13-nagios-vulnerabilities-7-will-shock-you/
ADVISORYhttps://www.nagios.com/downloads/nagios-xi/change-log/
ADVISORYhttp://packetstormsecurity.com/files/162783/Nagios-XI-Fusion-Privilege-Escalation-Cross-Site-Scripting-Code-Execution.html
ADVISORYhttps://skylightcyber.com/2021/05/20/13-nagios-vulnerabilities-7-will-shock-you/
ADVISORYhttps://www.nagios.com/downloads/nagios-xi/change-log/

All References (6)

→
http://packetstormsecurity.com/files/162783/Nagios-XI-Fusion-Privilege-Escalation-Cross-Site-Scripting-Code-Execution.htmlThird Party Advisory · VDB Entry
→
https://skylightcyber.com/2021/05/20/13-nagios-vulnerabilities-7-will-shock-you/Exploit · Third Party Advisory
→
https://www.nagios.com/downloads/nagios-xi/change-log/Release Notes · Vendor Advisory
→
http://packetstormsecurity.com/files/162783/Nagios-XI-Fusion-Privilege-Escalation-Cross-Site-Scripting-Code-Execution.htmlThird Party Advisory · VDB Entry
→
https://skylightcyber.com/2021/05/20/13-nagios-vulnerabilities-7-will-shock-you/Exploit · Third Party Advisory
→
https://www.nagios.com/downloads/nagios-xi/change-log/Release Notes · Vendor Advisory

Quick Facts

CVE IDCVE-2020-28907
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-295
CISA KEVNo
Affected1 vendor(s)
PublishedMay 24, 2021

Related CVEs (CWE-295)

CVE-2026-4370
10.0
CVE-2015-2320
9.8
CVE-2018-21029
9.8
CVE-2018-12829
9.8
CVE-2015-7826
9.8
CVE-2019-18632
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-28907 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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