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CVE Record

CVE-2018-19410: PRTG Network Monitor before 18.2.40.1683 allows remote unauthenticated attackers to create users with read-...

PRTG Network Monitor before 18.2.40.1683 allows remote unauthenticated attackers to create users with read-write privileges (including administrator). A remote unauthenticated user can craft an HTTP request and override attributes of the 'include' directive in /public/login.htm and perform a Local File Inclusion attack, by including /api/addusers and executing it. By providing the 'id' and 'users' parameters, an unauthenticated attacker can create a user with read-write privileges (including administrator).

CriticalCVSS 9.8Known exploitedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

CVE-2018-19410 lets an unauthenticated remote attacker create a read-write or administrator user in vulnerable PRTG Network Monitor systems. For executives, this is a direct path to management-console takeover if an affected instance is reachable.

Executive priority

Treat this as urgent for any exposed or business-critical PRTG deployment. The vulnerability is critical, unauthenticated, remotely reachable, and listed in CISA KEV, making delayed remediation hard to justify.

Technical view

PRTG Network Monitor before 18.2.40.1683 can be abused through /public/login.htm by overriding include directive attributes to include /api/addusers. With crafted id and users parameters, an unauthenticated attacker can trigger user creation with read-write privileges, including administrator.

Likely exposure

Exposure is most likely where PRTG Network Monitor web interfaces before 18.2.40.1683 are reachable from untrusted networks, especially the internet. The provided affected-product metadata is incomplete, so confirm product and version from asset inventory.

Exploitation context

CISA KEV lists CVE-2018-19410, which supports known exploitation. The source bundle does not provide campaign details, exploit timing, or attacker targets, so assume active risk without inferring specific threat actors.

Researcher notes

The source evidence is strong for vulnerability mechanics, affected version boundary, CVSS 9.8, and KEV status. It is incomplete for exact vendor remediation notes, exploitation campaigns, and affected CPE metadata.

Mitigation direction

  • Upgrade PRTG Network Monitor to 18.2.40.1683 or later.
  • Restrict PRTG web interface access to trusted administrative networks.
  • Review vendor and CISA guidance for any additional required actions.
  • Remove unexpected read-write or administrator accounts after investigation.

Validation and detection

  • Inventory all PRTG Network Monitor instances and record versions.
  • Confirm no instance before 18.2.40.1683 is externally reachable.
  • Review account creation history for unexpected read-write or administrator users.
  • Check web access logs for suspicious requests to /public/login.htm and /api/addusers.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

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CVE-2018-19410 mapping review

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.8 (3.1)
Known Exploited
Yes
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CISA KEV status

Status
Known exploited
Source
CISA / ADP
Date added
Not provided

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
9.8CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

9.8Critical
CVSS 3.1 vector shape for CVE-2018-19410Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.