Patchfirst
CVE-2026-84411 Public exploit Critical · 9.8 EPSS 0.9%

The web management service in affected RouterOS versions contains an integer underflow in its HTTP request body…

MikroTik · RouterOS

Summary

The web management service in MikroTik RouterOS contains an integer underflow in its HTTP request body handling. An unauthenticated attacker with network access to the service can send a single crafted request to execute arbitrary code as root or cause a denial of service, with no user interaction required.

Official description · NVD

The web management service in affected RouterOS versions contains an integer underflow in its HTTP request body handling that is reachable before authentication. This can be leveraged by an unauthenticated network attacker to achieve arbitrary code execution as root, or to cause a denial of service, using a single crafted request.

Breakdown
25.3 / 100
Exploited
Not confirmed
Reports
0
Tactics
0/15

Public exploit code (PoC-in-GitHub) appeared 8 days after disclosure. No confirmed exploitation is recorded.

  1. Disclosedday 0
  2. Public exploit codePoC-in-GitHub+8 days

techniques

No techniques linked

No ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.

What security researchers reported

Not named in any threat report yet

Also mentioned in 5 community threat pulses (AlienVault OTX)

Weaker evidence

Pulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.

References

3 links, grouped by NVD tag
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