Vulnerability-Lookup

CNVD-2026-05940

Vulnerability from cnvd - Published: 2026-01-22

Title

GNU InetUtils Telnetd远程认证绕过漏洞

Description

GNU InetUtils telnetd是GNU InetUtils套件中的远程登录服务守护进程，监听TCP 23端口，为客户端提供基于Telnet协议的明文终端接入能力。 GNU InetUtils Telnetd存在远程认证绕过漏洞，攻击者可利用该漏洞通过设置USER环境变量为"-froot"实现远程认证绕过，在无需任何口令的情况下直接获取目标主机的root shell。

Severity

高

Patch Name

GNU InetUtils Telnetd远程认证绕过漏洞的补丁

Patch Description

Formal description

用户可联系供应商获得补丁信息： https://www.openwall.com/lists/oss-security/2026/01/20/2

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-24061

Impacted products

Name
Gnu GNU Inetutils >=1.9.3，<= 2.7

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-24061"
    }
  },
  "description": "GNU InetUtils telnetd\u662fGNU InetUtils\u5957\u4ef6\u4e2d\u7684\u8fdc\u7a0b\u767b\u5f55\u670d\u52a1\u5b88\u62a4\u8fdb\u7a0b\uff0c\u76d1\u542cTCP 23\u7aef\u53e3\uff0c\u4e3a\u5ba2\u6237\u7aef\u63d0\u4f9b\u57fa\u4e8eTelnet\u534f\u8bae\u7684\u660e\u6587\u7ec8\u7aef\u63a5\u5165\u80fd\u529b\u3002\n\nGNU InetUtils Telnetd\u5b58\u5728\u8fdc\u7a0b\u8ba4\u8bc1\u7ed5\u8fc7\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u8bbe\u7f6eUSER\u73af\u5883\u53d8\u91cf\u4e3a\"-froot\"\u5b9e\u73b0\u8fdc\u7a0b\u8ba4\u8bc1\u7ed5\u8fc7\uff0c\u5728\u65e0\u9700\u4efb\u4f55\u53e3\u4ee4\u7684\u60c5\u51b5\u4e0b\u76f4\u63a5\u83b7\u53d6\u76ee\u6807\u4e3b\u673a\u7684root shell\u3002",
  "formalWay": "\u7528\u6237\u53ef\u8054\u7cfb\u4f9b\u5e94\u5546\u83b7\u5f97\u8865\u4e01\u4fe1\u606f\uff1a\r\nhttps://www.openwall.com/lists/oss-security/2026/01/20/2",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-05940",
  "openTime": "2026-01-22",
  "patchDescription": "GNU InetUtils telnetd\u662fGNU InetUtils\u5957\u4ef6\u4e2d\u7684\u8fdc\u7a0b\u767b\u5f55\u670d\u52a1\u5b88\u62a4\u8fdb\u7a0b\uff0c\u76d1\u542cTCP 23\u7aef\u53e3\uff0c\u4e3a\u5ba2\u6237\u7aef\u63d0\u4f9b\u57fa\u4e8eTelnet\u534f\u8bae\u7684\u660e\u6587\u7ec8\u7aef\u63a5\u5165\u80fd\u529b\u3002\r\n\r\nGNU InetUtils Telnetd\u5b58\u5728\u8fdc\u7a0b\u8ba4\u8bc1\u7ed5\u8fc7\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u8bbe\u7f6eUSER\u73af\u5883\u53d8\u91cf\u4e3a\"-froot\"\u5b9e\u73b0\u8fdc\u7a0b\u8ba4\u8bc1\u7ed5\u8fc7\uff0c\u5728\u65e0\u9700\u4efb\u4f55\u53e3\u4ee4\u7684\u60c5\u51b5\u4e0b\u76f4\u63a5\u83b7\u53d6\u76ee\u6807\u4e3b\u673a\u7684root shell\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "GNU InetUtils Telnetd\u8fdc\u7a0b\u8ba4\u8bc1\u7ed5\u8fc7\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Gnu GNU Inetutils \u003e=1.9.3\uff0c\u003c= 2.7"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-24061",
  "serverity": "\u9ad8",
  "submitTime": "2026-01-22",
  "title": "GNU InetUtils Telnetd\u8fdc\u7a0b\u8ba4\u8bc1\u7ed5\u8fc7\u6f0f\u6d1e"
}

CVE-2026-24061 (GCVE-0-2026-24061)

Vulnerability from cvelistv5 – Published: 2026-01-21 06:42 – Updated: 2026-09-29 19:43

Summary

telnetd in GNU Inetutils through 2.7 allows remote authentication bypass via a "-f root" value for the USER environment variable.

Severity

9.8 (Critical)


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

SSVC

Exploitation: active Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-27 04:55 UTC

CWE

CWE-88 - Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2350 records in the last 180 days details

References

14 references

URL	Tags
https://www.openwall.com/lists/oss-security/2026/…
https://www.openwall.com/lists/oss-security/2026/…
https://www.gnu.org/software/inetutils/
https://lists.gnu.org/archive/html/bug-inetutils/…
https://codeberg.org/inetutils/inetutils/commit/f…
https://codeberg.org/inetutils/inetutils/commit/c…
https://www.vicarius.io/vsociety/posts/cve-2026-2…
https://www.vicarius.io/vsociety/posts/cve-2026-2…
https://redteam.ae/blog/cve-2026-24061-inetutils-…
https://www.openwall.com/lists/oss-security/2026/…	exploit
https://www.labs.greynoise.io/grimoire/2026-01-22…	third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource
http://www.openwall.com/lists/oss-security/2026/01/22/1
https://lists.debian.org/debian-lts-announce/2026…

Impacted products

1 product

Vendor	Product	Version
GNU	Inetutils	Affected: 1.9.3 , ≤ 2.7 (custom) cpe:2.3:a:gnu:inetutils::::::::

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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