CVE-2020-28907Public exploit

Root code execution via untrusted update download

Published May 24, 2021 · Updated Aug 4, 2024

Improper certificate validation in Nagios Fusion 4.1.8 and earlier allows attackers to execute code as root through a forged update. The upgrade_to_latest.sh script downloads an update package over TLS without rejecting an untrusted server certificate after attacker-controlled proxy settings redirect the request. Access in the Apache service account is required, and replacing the package yields root-level execution when the privileged updater runs it.

CVSS severity9.8
Critical
EPSS probability3.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Nagios Fusion 4.1.8 and earlier allows attackers to execute code as root through a forged update. The upgrade_to_latest.sh script downloads an update package over TLS without rejecting an untrusted server certificate after attacker-controlled proxy settings redirect the request. Access in the Apache service account is required, and replacing the package yields root-level execution when the privileged updater runs it.

The record

CVE
CVE-2020-28907
Published
May 24, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-295, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 24, 2021CVE publishedPublication date reported by the CVE source.
  2. 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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1068Exploitation for Privilege Escalation

Public exploit references

  • SoyGunfunctional · demonstrated

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

Technologies

Your stack

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Your stack

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