FKIE_CVE-2026-23740

Vulnerability from fkie_nvd - Published: 2026-02-06 17:16 - Updated: 2026-06-17 10:22
Summary
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, when ast_coredumper writes its gdb init and output files to a directory that is world-writable (for example /tmp), an attacker with write permission(which is all users on a linux system) to that directory can cause root to execute arbitrary commands or overwrite arbitrary files by controlling the gdb init file and output paths. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.
Impacted products
Vendor Product Version
sangoma certified_asterisk 13.13.0
sangoma certified_asterisk 13.13.0
sangoma certified_asterisk 13.13.0
sangoma certified_asterisk 13.13.0
sangoma certified_asterisk 13.13.0
sangoma certified_asterisk 13.13.0
sangoma certified_asterisk 13.13.0
sangoma certified_asterisk 13.13.0
sangoma certified_asterisk 13.13.0
sangoma certified_asterisk 13.13.0
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8
sangoma certified_asterisk 16.8.0
sangoma certified_asterisk 16.8.0
sangoma certified_asterisk 16.8.0
sangoma certified_asterisk 16.8.0
sangoma certified_asterisk 16.8.0
sangoma certified_asterisk 16.8.0
sangoma certified_asterisk 16.8.0
sangoma certified_asterisk 16.8.0
sangoma certified_asterisk 16.8.0
sangoma certified_asterisk 16.8.0
sangoma certified_asterisk 16.8.0
sangoma certified_asterisk 16.8.0
sangoma certified_asterisk 16.8.0
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 18.9
sangoma certified_asterisk 20.7
sangoma certified_asterisk 20.7
sangoma certified_asterisk 20.7
sangoma certified_asterisk 20.7
sangoma certified_asterisk 20.7
sangoma certified_asterisk 20.7
sangoma certified_asterisk 20.7
sangoma certified_asterisk 20.7
sangoma certified_asterisk 20.7
sangoma asterisk *
sangoma asterisk *
sangoma asterisk *
sangoma asterisk *

{
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          "vendor": "asterisk",
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              "version": "\u003c 23.2.2"
            },
            {
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            },
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            },
            {
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              "version": "\u003c 20.18.2"
            },
            {
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              "version": "\u003c 20.7-cert9"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
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          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, when ast_coredumper writes its gdb init and output files to a directory that is world-writable (for example /tmp), an attacker with write permission(which is all users on a linux system) to that directory can cause root to execute arbitrary commands or overwrite arbitrary files by controlling the gdb init file and output paths. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2."
    },
    {
      "lang": "es",
      "value": "Asterisk es una centralita privada y un kit de herramientas de telefon\u00eda de c\u00f3digo abierto. Antes de las versiones 20.7-cert9, 20.18.2, 21.12.1, 22.8.2 y 23.2.2, cuando ast_coredumper escribe sus archivos de inicializaci\u00f3n y salida de gdb en un directorio con permisos de escritura para todos (por ejemplo, /tmp), un atacante con permiso de escritura (que es para todos los usuarios en un sistema Linux) en ese directorio puede hacer que root ejecute comandos arbitrarios o sobrescriba archivos arbitrarios controlando las rutas del archivo de inicializaci\u00f3n de gdb y de los archivos de salida. Este problema ha sido parcheado en las versiones 20.7-cert9, 20.18.2, 21.12.1, 22.8.2 y 23.2.2."
    }
  ],
  "id": "CVE-2026-23740",
  "lastModified": "2026-06-17T10:22:01.667",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 0.0,
          "baseSeverity": "NONE",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 0.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-23740",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-06T19:11:52.277402Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-06T17:16:26.290",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/asterisk/asterisk/security/advisories/GHSA-xpc6-x892-v83c"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-427"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.