CVE-2020-28908Known exploitationPublic exploit

Apache-to-nagios escalation via command injection

Published May 24, 2021 · Updated Aug 4, 2024

Command injection in Nagios Fusion 4.1.8 and earlier allows local users running as Apache to execute commands as nagios. The cmd_subsys.php command processor insufficiently sanitizes attacker-controlled command data before incorporating it into a command line for shell execution. Reachability requires prior Apache-context code execution or equivalent command-data control; successful exploitation gains the nagios account's privileges.

CVSS severity9.8
Critical
EPSS probability5.67%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Nagios Fusion 4.1.8 and earlier allows local users running as Apache to execute commands as nagios. The cmd_subsys.php command processor insufficiently sanitizes attacker-controlled command data before incorporating it into a command line for shell execution. Reachability requires prior Apache-context code execution or equivalent command-data control; successful exploitation gains the nagios account's privileges.

The record

CVE
CVE-2020-28908
Published
May 24, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059.004, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 20, 2021Exploitation reportedSoyGun Nagios Fusion and XI exploit chain
  2. May 24, 2021CVE publishedPublication date reported by the CVE source.
  3. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Unix Shell
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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