CVE-2021-33177Network attack vector

Authenticated SQL injection via unsafe UPDATE construction

Published Oct 14, 2021 · Updated Aug 3, 2024

SQL injection in Nagios XI before 5.8.5 allows remote authenticated users to execute arbitrary SQL through the Bulk Modifications tool. For some single-configuration option types, the tool places attacker-controlled values into an UPDATE statement without adequate neutralization. Access to Bulk Modifications, typically held by an administrator, is required; on the default PostgreSQL configuration, injected queries can invoke arbitrary database functions.

CVSS severity8.8
High
EPSS probability10.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in Nagios XI before 5.8.5 allows remote authenticated users to execute arbitrary SQL through the Bulk Modifications tool. For some single-configuration option types, the tool places attacker-controlled values into an UPDATE statement without adequate neutralization. Access to Bulk Modifications, typically held by an administrator, is required; on the default PostgreSQL configuration, injected queries can invoke arbitrary database functions.

The record

CVE
CVE-2021-33177
Published
Oct 14, 2021
Updated
Aug 3, 2024
Vendor
Nagios Enterprises, LLC
Product
Nagios XI
Classifications
CWE-89, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<5.8.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nagios Enterprises, LLC · Nagios XIversion=<5.8.5

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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