The web management service in affected RouterOS versions contains an integer underflow in its HTTP request body handling that is reachable before… (CVE-2026-84411)
A critical integer underflow vulnerability exists in the web management service of affected RouterOS versions. This flaw occurs in the HTTP request body handling before authentication, allowing an unauthenticated attacker to execute arbitrary code as root or cause a denial of service with a single crafted request.
AI Analysis
Technical Summary
The web management service in certain RouterOS versions contains an integer underflow vulnerability in its HTTP request body processing that is exploitable prior to authentication. An unauthenticated network attacker can leverage this flaw to achieve arbitrary code execution with root privileges or trigger a denial of service condition by sending a specially crafted HTTP request. The vulnerability is identified as CWE-191 and has a CVSS v3.1 base score of 9.8, indicating critical severity.
Potential Impact
Successful exploitation allows an unauthenticated attacker to execute arbitrary code as root or cause a denial of service on the affected RouterOS device. This compromises device integrity, confidentiality, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
The web management service in affected RouterOS versions contains an integer underflow in its HTTP request body handling that is reachable before… (CVE-2026-84411)
Description
A critical integer underflow vulnerability exists in the web management service of affected RouterOS versions. This flaw occurs in the HTTP request body handling before authentication, allowing an unauthenticated attacker to execute arbitrary code as root or cause a denial of service with a single crafted request.
CVSS v3.1
Score 9.8critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The web management service in certain RouterOS versions contains an integer underflow vulnerability in its HTTP request body processing that is exploitable prior to authentication. An unauthenticated network attacker can leverage this flaw to achieve arbitrary code execution with root privileges or trigger a denial of service condition by sending a specially crafted HTTP request. The vulnerability is identified as CWE-191 and has a CVSS v3.1 base score of 9.8, indicating critical severity.
Potential Impact
Successful exploitation allows an unauthenticated attacker to execute arbitrary code as root or cause a denial of service on the affected RouterOS device. This compromises device integrity, confidentiality, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-xj4h-hf2x-2q43
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-84411"]
- Database Specific Severity
- CRITICAL
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac1399fa43b0b3b89d69a86
Added to database: 10/03/2026, 17:21:35 UTC
Last enriched: 10/03/2026, 17:36:45 UTC
Last updated: 10/04/2026, 02:46:07 UTC
Views: 3
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