Vulnerability-Lookup

FKIE_CVE-2026-8170

Vulnerability from fkie_nvd - Published: 2026-07-20 18:16 - Updated: 2026-07-21 20:25

Severity

8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Summary

The mv, cp, and rm file utilities exposed within the ExtremeXOS (EXOS) shell environment fail to safely canonicalize paths and follow symbolic links outside of the intended privilege boundary. An attacker with low-privilege CLI access can create a symbolic link that references a privileged filesystem location and then invoke the affected utilities to read, modify, or replace security-critical files outside of their authorized scope. Under certain conditions, this may enable escalation to root-level access and persistent modification of the device software stack. Exploitation is possible remotely by an attacker holding a low-privilege account, or locally via the serial console. Extreme would like to thank Hadrien Barral (Université Gustave Eiffel) and Georges-Axel Jaloyan (French Ministry of the Interior) for responsible disclosure of their findings.

References

	URL	Tags
	1c053176-eef3-4d6a-ae0b-24728c86587b	https://www.extremenetworks.com/support/policies/product-security

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "Switch Engine"
          ],
          "product": "Switch Engine (EXOS)",
          "vendor": "Extreme Networks",
          "versions": [
            {
              "lessThan": "31.7.4",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            },
            {
              "lessThan": "32.7.4.15",
              "status": "affected",
              "version": "32.0.0",
              "versionType": "custom"
            },
            {
              "lessThan": "33.1.100",
              "status": "affected",
              "version": "33.0.0",
              "versionType": "custom"
            },
            {
              "lessThan": "33.7.1",
              "status": "affected",
              "version": "33.2.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "1c053176-eef3-4d6a-ae0b-24728c86587b"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The mv, cp, and rm file utilities exposed within the ExtremeXOS (EXOS) shell environment fail to safely canonicalize paths and follow symbolic links outside of the intended privilege boundary. An attacker with low-privilege CLI access can create a symbolic link that references a privileged filesystem location and then invoke the affected utilities to read, modify, or replace security-critical files outside of their authorized scope. Under certain conditions, this may enable escalation to root-level access and persistent modification of the device software stack. Exploitation is possible remotely by an attacker holding a low-privilege account, or locally via the serial console.\n\n\n\nExtreme would like to thank Hadrien Barral (Universit\u00e9 Gustave Eiffel) and Georges-Axel Jaloyan (French Ministry of the Interior) for responsible disclosure of their findings."
    }
  ],
  "id": "CVE-2026-8170",
  "lastModified": "2026-07-21T20:25:45.920",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.7,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "1c053176-eef3-4d6a-ae0b-24728c86587b",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-8170",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-20T18:26:34.100325Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-20T18:16:56.570",
  "references": [
    {
      "source": "1c053176-eef3-4d6a-ae0b-24728c86587b",
      "url": "https://www.extremenetworks.com/support/policies/product-security"
    }
  ],
  "sourceIdentifier": "1c053176-eef3-4d6a-ae0b-24728c86587b",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        }
      ],
      "source": "1c053176-eef3-4d6a-ae0b-24728c86587b",
      "type": "Secondary"
    }
  ]
}

CVE-2026-8170 (GCVE-0-2026-8170)

Vulnerability from cvelistv5 – Published: 2026-07-20 17:34 – Updated: 2026-07-20 19:21

Title

ExtremeXOS Privilege Escalation via Symlink Following in File Utilities

Summary

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

ExtremeNetworks

References

1 reference

URL	Tags
https://www.extremenetworks.com/support/policies/…

Impacted products

1 product

Vendor	Product	Version
Extreme Networks	Switch Engine (EXOS)	Affected: 0 , < 31.7.4 (custom) Affected: 32.0.0 , < 32.7.4.15 (custom) Affected: 33.0.0 , < 33.1.100 (custom) Affected: 33.2.0 , < 33.7.1 (custom)

Credits

Extreme would like to thank Hadrien Barral (Université Gustave Eiffel) and Georges-Axel Jaloyan (French Ministry of the Interior) for responsible disclosure of their findings.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-8170",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-20T18:26:34.100325Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-20T18:26:44.179Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "Switch Engine"
          ],
          "product": "Switch Engine (EXOS)",
          "vendor": "Extreme Networks",
          "versions": [
            {
              "lessThan": "31.7.4",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            },
            {
              "lessThan": "32.7.4.15",
              "status": "affected",
              "version": "32.0.0",
              "versionType": "custom"
            },
            {
              "lessThan": "33.1.100",
              "status": "affected",
              "version": "33.0.0",
              "versionType": "custom"
            },
            {
              "lessThan": "33.7.1",
              "status": "affected",
              "version": "33.2.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Extreme would like to thank Hadrien Barral (Universit\u00e9 Gustave Eiffel) and Georges-Axel Jaloyan (French Ministry of the Interior) for responsible disclosure of their findings."
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eThe mv, cp, and rm file utilities exposed within the ExtremeXOS (EXOS) shell environment fail to safely canonicalize paths and follow symbolic links outside of the intended privilege boundary. An attacker with low-privilege CLI access can create a symbolic link that references a privileged filesystem location and then invoke the affected utilities to read, modify, or replace security-critical files outside of their authorized scope. Under certain conditions, this may enable escalation to root-level access and persistent modification of the device software stack. Exploitation is possible remotely by an attacker holding a low-privilege account, or locally via the serial console.\u003c/p\u003e\u003cp\u003eExtreme would like to thank Hadrien Barral (Universit\u00e9 Gustave Eiffel) and Georges-Axel Jaloyan (French Ministry of the Interior) for responsible disclosure of their findings.\u003c/p\u003e"
            }
          ],
          "value": "The mv, cp, and rm file utilities exposed within the ExtremeXOS (EXOS) shell environment fail to safely canonicalize paths and follow symbolic links outside of the intended privilege boundary. An attacker with low-privilege CLI access can create a symbolic link that references a privileged filesystem location and then invoke the affected utilities to read, modify, or replace security-critical files outside of their authorized scope. Under certain conditions, this may enable escalation to root-level access and persistent modification of the device software stack. Exploitation is possible remotely by an attacker holding a low-privilege account, or locally via the serial console.\n\n\n\nExtreme would like to thank Hadrien Barral (Universit\u00e9 Gustave Eiffel) and Georges-Axel Jaloyan (French Ministry of the Interior) for responsible disclosure of their findings."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-59",
              "description": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
              "lang": "en",
              "type": "CWE"
            }
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T19:21:08.881Z",
        "orgId": "1c053176-eef3-4d6a-ae0b-24728c86587b",
        "shortName": "ExtremeNetworks"
      },
      "references": [
        {
          "name": "Extreme Networks Product Security",
          "url": "https://www.extremenetworks.com/support/policies/product-security"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eExtreme Networks has released fixed versions of Switch Engine (EXOS) that address this vulnerability. Customers should upgrade to one of the following releases or later: 31.7.4, 32.7.4.15, 33.1.100, or 33.7.1.\u003c/p\u003e"
            }
          ],
          "value": "Extreme Networks has released fixed versions of Switch Engine (EXOS) that address this vulnerability. Customers should upgrade to one of the following releases or later: 31.7.4, 32.7.4.15, 33.1.100, or 33.7.1."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "ExtremeXOS Privilege Escalation via Symlink Following in File Utilities",
      "workarounds": [
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          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eWhere immediate upgrade is not feasible, customers should: (1) restrict CLI access to trusted administrators only; (2) enforce strong authentication and rotate any default credentials; (3) restrict physical access to serial console ports; and (4) monitor device logs for anomalous shell activity and filesystem modifications.\u003c/p\u003e"
            }
          ],
          "value": "Where immediate upgrade is not feasible, customers should: (1) restrict CLI access to trusted administrators only; (2) enforce strong authentication and rotate any default credentials; (3) restrict physical access to serial console ports; and (4) monitor device logs for anomalous shell activity and filesystem modifications."
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 1.0.2"
      }
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  "cveMetadata": {
    "assignerOrgId": "1c053176-eef3-4d6a-ae0b-24728c86587b",
    "assignerShortName": "ExtremeNetworks",
    "cveId": "CVE-2026-8170",
    "datePublished": "2026-07-20T17:34:10.950Z",
    "dateReserved": "2026-05-08T12:59:11.022Z",
    "dateUpdated": "2026-07-20T19:21:08.881Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.

Action not permitted

FKIE_CVE-2026-8170

CVE-2026-8170 (GCVE-0-2026-8170)

Tags

Sightings

Nomenclature