Vulnerability-Lookup

FKIE_CVE-2021-21005

Vulnerability from fkie_nvd - Published: 2021-06-25 19:15 - Updated: 2026-06-17 03:34

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

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.

References

	URL	Tags
	info@cert.vde.com	https://cert.vde.com/en-us/advisories/vde-2021-023	Third Party Advisory
	af854a3a-2127-422b-91ae-364da2661108	https://cert.vde.com/en-us/advisories/vde-2021-023	Third Party Advisory

Impacted products

Vendor	Product	Version
phoenixcontact	fl_switch_smcs_16tx_firmware	*
phoenixcontact	fl_switch_smcs_16tx	-
phoenixcontact	fl_switch_smcs_14tx\/2fx_firmware	*
phoenixcontact	fl_switch_smcs_14tx\/2fx	-
phoenixcontact	fl_switch_smcs_14tx\/2fx-sm_firmware	*
phoenixcontact	fl_switch_smcs_14tx\/2fx-sm	-
phoenixcontact	fl_switch_smcs_8gt_firmware	*
phoenixcontact	fl_switch_smcs_8gt	-
phoenixcontact	fl_switch_smcs_6gt\/2sfp_firmware	*
phoenixcontact	fl_switch_smcs_6gt\/2sfp	-
phoenixcontact	fl_switch_smcs_8tx-pn_firmware	*
phoenixcontact	fl_switch_smcs_8tx-pn	-
phoenixcontact	fl_switch_smcs_4tx-pn_firmware	*
phoenixcontact	fl_switch_smcs_4tx-pn	-
phoenixcontact	fl_switch_smcs_8tx_firmware	*
phoenixcontact	fl_switch_smcs_8tx	-
phoenixcontact	fl_switch_smcs_6tx\/2sfp_firmware	*
phoenixcontact	fl_switch_smcs_6tx\/2sfp	-
phoenixcontact	fl_switch_smn_6tx\/2pof-pn_firmware	*
phoenixcontact	fl_switch_smn_6tx\/2pof-pn	-
phoenixcontact	fl_switch_smn_8tx-pn_firmware	*
phoenixcontact	fl_switch_smn_8tx-pn	-
phoenixcontact	fl_switch_smn_6tx\/2fx_firmware	*
phoenixcontact	fl_switch_smn_6tx\/2fx	-
phoenixcontact	fl_switch_smn_6tx\/2fx_sm_firmware	*
phoenixcontact	fl_switch_smn_6tx\/2fx_sm	-
phoenixcontact	fl_nat_smn_8tx_firmware	*
phoenixcontact	fl_nat_smn_8tx	-
phoenixcontact	fl_nat_smn_8tx-m_firmware	*
phoenixcontact	fl_nat_smn_8tx-m	-

JSON

To clipboard

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      "affectedData": [
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          "product": "FL SWITCH",
          "vendor": "Phoenix Contact",
          "versions": [
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              "lessThanOrEqual": "4.70",
              "status": "affected",
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            },
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              "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)",
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            },
            {
              "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"
            },
            {
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              "status": "affected",
              "version": "SMCS 6TX/2SFP (2989323)",
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            },
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              "status": "affected",
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            },
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              "status": "affected",
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            },
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            },
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "En los productos de la serie Phoenix Contact FL SWITCH SMCS en m\u00faltiples versiones, si un atacante env\u00eda un paquete TCP dise\u00f1ado a mano con el Urgent-Flag ajustado y el Urgent-Pointer ajustado en 0, la pila de red se bloquear\u00e1. El dispositivo debe ser reiniciado despu\u00e9s"
    }
  ],
  "id": "CVE-2021-21005",
  "lastModified": "2026-06-17T03:34:38.773",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
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          "accessVector": "NETWORK",
          "authentication": "NONE",
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          "baseScore": 7.8,
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          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
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  "published": "2021-06-25T19:15:08.797",
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      "source": "info@cert.vde.com",
      "tags": [
        "Third Party Advisory"
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      "url": "https://cert.vde.com/en-us/advisories/vde-2021-023"
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          "lang": "en",
          "value": "CWE-362"
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}

CVE-2021-21005 (GCVE-0-2021-21005)

Vulnerability from cvelistv5 – Published: 2021-06-25 18:25 – Updated: 2024-09-17 02:17

Title

Race Condition Vulnerability in Phoenix Contact FL SWITCH SMCS series products

Summary

Severity

7.5 (High)


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

CWE

CWE-362 - Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization)

Assigner

CERTVDE icscert root

References

1 reference

URL	Tags
https://cert.vde.com/en-us/advisories/vde-2021-023	x_refsource_CONFIRM

Impacted products

2 products

Vendor	Product	Version
Phoenix Contact	FL SWITCH	Affected: SMCS 16TX (2700996) , ≤ 4.70 (custom) Affected: SMCS 14TX/2FX (2700997) , ≤ 4.70 (custom) Affected: SMCS 14TX/2FX-SM (2701466) , ≤ 4.70 (custom) Affected: SMCS 8GT (2891123) , ≤ 4.70 (custom) Affected: SMCS 6GT/2SFP (2891479) , ≤ 4.70 (custom) Affected: SMCS 8TX-PN (2989103) , ≤ 4.70 (custom) Affected: SMCS 4TX-PN (2989093) , ≤ 4.70 (custom) Affected: SMCS 8TX (2989226) , ≤ 4.70 (custom) Affected: SMCS 6TX/2SFP (2989323) , ≤ 4.70 (custom) Affected: SMN 6TX/2POF-PN (2700290) , ≤ 4.70 (custom) Affected: SMN 8TX-PN (2989501) , ≤ 4.70 (custom) Affected: SMN 6TX/2FX (2989543) , ≤ 4.70 (custom) Affected: SMN 6TX/2FX SM (2989556) , ≤ 4.70 (custom)
Phoenix Contact	FL NAT	Affected: SMN 8TX (2989365) , ≤ 4.63 (custom) Affected: SMN 8TX-M (2702443) , ≤ 4.63 (custom)

Date Public

2021-06-23 00:00

Credits

This vulnerability has been discovered and reported by Anne Borcherding, Fraunhofer- Institut für Optronik, Systemtechnik und Bildauswertung IOSB. PHOENIX CONTACT thanks CERT@VDE for the coordination and support with this publication.

Show details on NVD website

JSON

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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.