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CVE-2026-61554— emp3r0r has an unauthenticated HTTP Polling DoS

Quick assessment

Affected
jm33-m0 emp3r0r
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

emp3r0r 是一款专为 Linux 环境设计、由 Linux 用户开发的 C2（Command and Control，命令与控制）工具。在 4.2.5 版本之前，其 C2 传输层在完成 CBOR 身份验证之前，即接受由攻击者控制的 HTTP 轮询会话。一个未经身份验证的远程攻击者可以创建任意的轮询会话，并发送会被转发至 C2 分派路径的请求体。这可能会消耗服务器资源，并触发认证前的 C2 处理逻辑。该问题已在 4.2.5 版本中修复。

CVSS 7.5 · High

Possible ATT&CK Techniques 2 AI

T1573.003 T1571.002
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I. Basic Information for CVE-2026-61554

Vulnerability Information
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Vulnerability Title
emp3r0r has an unauthenticated HTTP Polling DoS
Source: CVE Program / CVE List V5
Vulnerability Description
emp3r0r is a C2 designed by Linux users for Linux environments. Prior to version 4.2.5, the `http_poll` C2 transport accepts attacker-controlled HTTP polling sessions before CBOR `MsgAuth` authentication is completed. A remote unauthenticated attacker can create arbitrary polling sessions and send request bodies that are forwarded into the C2 dispatch path. This can consume server resources and trigger pre-auth C2 processing. Version 4.2.5 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
jm33-m0 emp3r0r < 4.2.5 -

II. Public POCs for CVE-2026-61554

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III. Intelligence Information for CVE-2026-61554

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Vendor Advisories for CVE-2026-61554 (1)

Proof of Concept for CVE-2026-61554 (1)

IV. Related Vulnerabilities

Same product: emp3r0r
Same vendor: jm33-m0
Same weakness: CWE-400

V. Comments for CVE-2026-61554

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