CVE-2018-19410
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).
do firstApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Can a WAF block it? Partly. The attack is performed by sending a crafted HTTP request with specific parameters to a known endpoint, which is unusual and can be detected by a WAF rule matching these parameters and the endpoint path. A WAF rule can match 'id' and 'users' parameters in an HTTP request to /api/addusers. No tracked WAF vendor has published a rule for this CVE yet, so you would write it yourself.
What a custom rule would match: 'id' and 'users' parameters in an HTTP request to /api/addusers
Also consider: patch · custom WAF rule
Based on an AI reading of the CVE description, and no vendor rule found yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.
Is CVE-2018-19410 being exploited?
Yes. CVE-2018-19410 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2018-19410?
CVE-2018-19410 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2018-19410?
Not known from our data. No patch reference has been recorded for CVE-2018-19410, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2018-19410 affect?
CVE-2018-19410 affects paessler:prtg_network_monitor. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
public exploits
Unvetted proof-of-concept code on GitHub: 1 GitHub proof of concept · 1 Nuclei template
- PRTG Network Monitor - Local File Inclusion · detection template · critical
Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.
cisa ssvc
- exploitation
- active
- automatable
- yes
- technical impact
- total
Assessed by CISA 4 Feb 2025 (SSVC 2.0.3).
timeline
- 21 Nov 2018Published
- 25 Jan 2024First proof-of-concept repository on GitHub (unvetted) · 1,890 days (about 5 years) later
- 4 Feb 2025Added to CISA KEV (exploited in the wild) · 376 days (about 1 year) later
- 4 Feb 2025CISA SSVC assessment: exploitation active · 1 day later
- 25 Feb 2025CISA remediation due date (US federal agencies) · 20 days later
- 21 Oct 2025CVE record last updated · 239 days (about 8 months) later
- 2 Nov 2026Analysed by vulneraibility.com · 377 days (about 1 year) later
- Linkptsecurity.com /ww-en/analytics/threatscape/pt-2018-24/
- Linkcisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-19410
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA KEV catalog: exploitation, date added, due date
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Nuclei templates: detection templates
- PoC-in-GitHub: GitHub repositories that claim a proof of concept
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.