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

Vulnerability from cvelistv5 – Published: 2026-01-21 06:42 – Updated: 2026-03-25 13:31
VLAI CISA Shadowserver Previdian
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
References
Impacted products
Vendor Product Version CPE status
GNU Inetutils Affected: 1.9.3 , ≤ 2.7 (custom)
    cpe:2.3:a:gnu:inetutils:*:*:*:*:*:*:*:*
Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: ce9ee6df-b43d-4c0b-b17f-7704049f6646

Vulnerability ID: CVE-2026-24061

Status: Confirmed

Status Updated: 2026-01-26 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-01-26
Asserted: 2026-01-26
Scope
Notes: KEV entry: GNU InetUtils Argument Injection Vulnerability | Affected: GNU / InetUtils | Description: GNU InetUtils contains an argument injection vulnerability in telnetd that could allow for remote authentication bypass via a "-f root" value for the USER environment variable. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-02-16 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://cgit.git.savannah.gnu.org/cgit/inetutils.git ; https://codeberg.org/inetutils/inetutils/commit/ccba9f748aa8d50a38d7748e2e60362edd6a32cc; https://codeberg.org/inetutils/inetutils/commit/fd702c02497b2f398e739e3119bed0b23dd7aa7b ; https://nvd.nist.gov/vuln/detail/CVE-2026-24061
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-88
Feed CISA Known Exploited Vulnerabilities Catalog
Product InetUtils
Due Date 2026-02-16
Date Added 2026-01-26
Vendorproject GNU
Vulnerabilityname GNU InetUtils Argument Injection Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 13:24 UTC | Updated: 2026-02-06 07:53 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 1d6c844c-e9bd-44c7-a8b7-a03d5316632b

Vulnerability ID: CVE-2026-24061

Status: Confirmed

Status Updated: 2026-01-23 16:10 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2026-01-23
Asserted: 2026-01-23
Last Seen: 2026-01-23
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: GNU Operating System / GNU Inetutils (telnetd) | Severity: CRITICAL (CVSS 9.8) | IoT: no | In CISA KEV: no | Honeypot connections on 2026-01-23: 115
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type brute-force
Class None
7D Avg 0
Vendor GNU Operating System
30D Avg 0
90D Avg 0
Product GNU Inetutils (telnetd)
Cisa Kev no
Connections 115
Observation Date 2026-01-23
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity CRITICAL
References
Created: 2026-07-01 07:18 UTC | Updated: 2026-07-01 12:45 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f8a20284-afc4-46e9-b242-2d85a54d53bd

Vulnerability ID: CVE-2026-24061

Status: Confirmed

Status Updated: 2026-06-01 10:49 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: telnetd in GNU Inetutils through 2.7 allows remote authentication bypass via a "-f root" value for the USER environment variable. | Affected: GNU / Inetutils | CVSS: 9.8 (CRITICAL) | EPSS: 0.98871 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title telnetd in GNU Inetutils through 2.7 allows remote authentication bypass via a "-f root" value for the USER environment variable.
Vendor GNU
Product Inetutils
Added Date 2026-06-01T10:49:50.064Z
Cvss Score 9.8
Epss Score 0.98871
Cvss Severity CRITICAL
Epss Percentile 0.99921
Used In Malware unknown
Ahead Of Cisa Kev 
{
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}
Not Yet In Cisa Kev False
References
Created: 2026-06-19 12:42 UTC | Updated: 2026-06-19 12:42 UTC
Show details on NVD website
To clipboard 

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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.