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CERTVDECVELIST:CVE-2021-21005

HistoryJun 23, 2021 - 12:00 a.m.

CVE-2021-21005 Race Condition Vulnerability in Phoenix Contact FL SWITCH SMCS series products

2021-06-2300:00:00

CWE-362

CERTVDE

www.cve.org

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

0.001 Low

EPSS

Percentile

42.5%

JSON

In Phoenix Contact FL SWITCH SMCS series products in multiple versions if an attacker sends a hand-crafted TCP-Packet with the Urgent-Flag set and the Urgent-Pointer set to 0, the network stack will crash. The device needs to be rebooted afterwards.

CNA Affected

[
  {
    "product": "FL SWITCH",
    "vendor": "Phoenix Contact",
    "versions": [
      {
        "lessThanOrEqual": "4.70",
        "status": "affected",
        "version": "SMCS 16TX (2700996)",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "4.70",
        "status": "affected",
        "version": "SMCS 14TX/2FX (2700997)",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "4.70",
        "status": "affected",
        "version": "SMCS 14TX/2FX-SM (2701466)",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "4.70",
        "status": "affected",
        "version": "SMCS 8GT (2891123)",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "4.70",
        "status": "affected",
        "version": "SMCS 6GT/2SFP (2891479)",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "4.70",
        "status": "affected",
        "version": "SMCS 8TX-PN (2989103)",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "4.70",
        "status": "affected",
        "version": "SMCS 4TX-PN (2989093)",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "4.70",
        "status": "affected",
        "version": "SMCS 8TX (2989226)",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "4.70",
        "status": "affected",
        "version": "SMCS 6TX/2SFP (2989323)",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "4.70",
        "status": "affected",
        "version": "SMN 6TX/2POF-PN (2700290)",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "4.70",
        "status": "affected",
        "version": "SMN 8TX-PN (2989501)",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "4.70",
        "status": "affected",
        "version": "SMN 6TX/2FX (2989543)",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "4.70",
        "status": "affected",
        "version": "SMN 6TX/2FX SM (2989556)",
        "versionType": "custom"
      }
    ]
  },
  {
    "product": "FL NAT",
    "vendor": "Phoenix Contact",
    "versions": [
      {
        "lessThanOrEqual": "4.63",
        "status": "affected",
        "version": "SMN 8TX (2989365)",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "4.63",
        "status": "affected",
        "version": "SMN 8TX-M (2702443)",
        "versionType": "custom"
      }
    ]
  }
]

References

cert.vde.com/en-us/advisories/vde-2021-023

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

0.001 Low

EPSS

Percentile

42.5%

JSON

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