CVE-2026-125406 (GCVE-0-2026-125406)

Vulnerability from cvelistv5 – Published: 2026-11-09 23:28 – Updated: 2026-11-09 23:28
VLAI
Title
Ettercap through 0.8.4.1 Stack Buffer Underwrite via Telnet Dissector Backspace Handling
Summary
Ettercap through 0.8.4.1 contains a stack buffer underwrite vulnerability in the telnet dissector in src/dissectors/ec_telnet.c that decrements the output pointer on backspace without a lower bound check. Attackers can send a telnet stream with more backspaces than preceding characters to write below the stack buffer, corrupting the stack of the Ettercap process that normally runs as root.
Severity
8.7 (High)
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-124 - Buffer Underwrite ('Buffer Underflow')
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
Ettercap ettercap Affected: 0 , ≤ 0.8.4.1 (custom)
    cpe:2.3:a:ettercap-project:ettercap:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-11-06 00:00
Credits
Adiel Sol, Arad Inbar, Erez Cohen, Nir Somech, Ben Grinberg, Daniel Lubel, Shir Sadon (DREAM Security Research Team) Emilio Escobar
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/Ettercap/ettercap",
          "product": "ettercap",
          "repo": "https://github.com/Ettercap/ettercap",
          "vendor": "Ettercap",
          "versions": [
            {
              "lessThanOrEqual": "0.8.4.1",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:ettercap-project:ettercap:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "0.8.4.1",
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        },
        {
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          "type": "remediation developer",
          "value": "Emilio Escobar"
        }
      ],
      "datePublic": "2026-11-06T00:00:00.000Z",
      "descriptions": [
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          "value": "Ettercap through 0.8.4.1 contains a stack buffer underwrite vulnerability in the telnet dissector in src/dissectors/ec_telnet.c that decrements the output pointer on backspace without a lower bound check. Attackers can send a telnet stream with more backspaces than preceding characters to write below the stack buffer, corrupting the stack of the Ettercap process that normally runs as root."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
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            "attackRequirements": "NONE",
            "attackVector": "ADJACENT",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
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            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "problemTypes": [
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      "providerMetadata": {
        "dateUpdated": "2026-11-09T23:28:07.044Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-w5ch-7c4x-crcc)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/Ettercap/ettercap/security/advisories/GHSA-w5ch-7c4x-crcc"
        },
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          "url": "https://github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98"
        },
        {
          "tags": [
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          ],
          "url": "https://github.com/Ettercap/ettercap/pull/1330"
        },
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          "tags": [
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          "url": "https://github.com/Ettercap/ettercap/blob/v0.8.4.1/src/dissectors/ec_telnet.c#L150-L159"
        },
        {
          "name": "VulnCheck Advisory: Ettercap through 0.8.4.1 Stack Buffer Underwrite via Telnet Dissector Backspace Handling",
          "tags": [
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          "url": "https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-stack-buffer-underwrite-via-telnet-dissector-backspace-handling"
        }
      ],
      "title": "Ettercap through 0.8.4.1 Stack Buffer Underwrite via Telnet Dissector Backspace Handling",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-125406",
    "datePublished": "2026-11-09T23:28:07.044Z",
    "dateReserved": "2026-11-09T22:03:17.371Z",
    "dateUpdated": "2026-11-09T23:28:07.044Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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