CVE-2019-9744

mediumpriority · track · 36EPSS 0.016 · 76 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.64% (76th) EPSS

CVSS 6.8 · medium

Is it mine?

17 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

An issue was discovered on PHOENIX CONTACT FL NAT SMCS 8TX, FL NAT SMN 8TX, FL NAT SMN 8TX-M, and FL NAT SMN 8TX-M-DMG devices. There is unauthorized access to the WEB-UI by attackers arriving from the same source IP address as an authenticated user, because this IP address is used as a session identifier.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

No vendor fix yet; a mitigation is available.

Mitigationphoenix_contact_psirt
Customers using Phoenix Contact FL NAT SMx devices are recommended to operate the devices in closed networks or protected with a suitable firewall.\ For detailed information on our recommendations for measures to protect network-capable devices, please refer to the [application note:](https://www.phoenixcontact.com/assets/downloads_ed/local_pc/web_dwl_technical_info/ah_en_industrial_security_107913_en_01.pdf) To protect the device from an attacker who has gained access to the closed network, or if there is a possibility that multiple users might share a VPN connection with a single endpoint IP, it might be considered to: log off from the WEB-UI immediately after administration\ disable the WEB-UI and use configuration access via SNMP instead
Mitigationindustrial Ethernet switch FL NAT SMCS 8TXcisa_csaf_ot
Disable the WEB-UI and use configuration access via SNMP instead. Ensure the system password is strong as this is also the SNMP write community.
Mitigationindustrial Ethernet switch FL NAT SMN 8TXcisa_csaf_ot
Disable the WEB-UI and use configuration access via SNMP instead. Ensure the system password is strong as this is also the SNMP write community.
Mitigationindustrial Ethernet switch FL NAT SMN 8TX-Mcisa_csaf_ot
Disable the WEB-UI and use configuration access via SNMP instead. Ensure the system password is strong as this is also the SNMP write community.
Mitigationindustrial Ethernet switch FL NAT SMN 8TX-M-DMGcisa_csaf_ot
Disable the WEB-UI and use configuration access via SNMP instead. Ensure the system password is strong as this is also the SNMP write community.

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–8.8

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v3.08.8highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.08.8highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · CISA US

v3.08.8highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · Phoenix Contact PSIRT DE

v3.08.1highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-384USprimaryCWE-284USCWE-284US

affected products (17)

Products and version ranges known to be affected.

industrial Ethernet switch FL NAT SMCS 8TX: (2989378)all versionscisa_csaf_otUS
industrial Ethernet switch FL NAT SMN 8TX-M-DMG: (2989352)all versionscisa_csaf_otUS
industrial Ethernet switch FL NAT SMN 8TX-M: (2702443)all versionscisa_csaf_otUS
industrial Ethernet switch FL NAT SMN 8TX: (2989365)all versionscisa_csaf_otUS
Phoenix Contact industrial Ethernet switch FL NAT SMCS 8TXall versionscisa_csaf_otUS
Phoenix Contact industrial Ethernet switch FL NAT SMN 8TXall versionscisa_csaf_otUS
Phoenix Contact industrial Ethernet switch FL NAT SMN 8TX-Mall versionscisa_csaf_otUS
Phoenix Contact industrial Ethernet switch FL NAT SMN 8TX-M-DMGall versionscisa_csaf_otUS
n/a n/a≤ n/aenisa_euvdEU
phoenixcontact fl nat smcs 8tx firmwareall versionsnvdUScpe:2.3:o:phoenixcontact:fl_nat_smcs_8tx_firmware:*:*:*:*:*:*:*:*
phoenixcontact fl nat smn 8tx firmwareall versionsnvdUScpe:2.3:o:phoenixcontact:fl_nat_smn_8tx_firmware:*:*:*:*:*:*:*:*
phoenixcontact fl nat smn 8tx-m firmwareall versionsnvdUScpe:2.3:o:phoenixcontact:fl_nat_smn_8tx-m_firmware:*:*:*:*:*:*:*:*
phoenixcontact fl nat smn 8tx-m-dmg firmwareall versionsnvdUScpe:2.3:o:phoenixcontact:fl_nat_smn_8tx-m-dmg_firmware:*:*:*:*:*:*:*:*
Firmware all versions installed on FL NAT SMN 8TX-Mall versionsphoenix_contact_psirtDE
Firmware all versions installed on FL NAT SMN 8TX-M-DMGall versionsphoenix_contact_psirtDE
Firmware all versions installed on FL NAT SMCS 8TXall versionsphoenix_contact_psirtDE
Firmware all versions installed on FL NAT SMN 8TXall versionsphoenix_contact_psirtDE

advisories (2)

Vendor and ecosystem advisories describing this.

VDE-2019-006PHOENIX CONTACT: unauthorized access to WEB-UI on FL NAT SMx2019-03-25csaf · phoenix_contact_psirtDE
After login the source IP is used as the session identifier, so that users sharing the same source IP are able to gain full authenticated access to the WEB-UI. The access attempt will only be successful if the former authorized session has not been terminated by the authorized user or by session timeout.
ICSA-19-155-02PHOENIX CONTACT FL NAT SMx2019-06-04icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability could allow unauthorized users full access to the device configuration.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd phoenix_contact_psirt NVD CVE.org MITRE

published 2019-03-26modified 2026-06-17

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references (12)

External citations — patches, advisories, analysis.

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