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CERTVDECVE-2021-21002

HistoryJun 25, 2021 - 7:15 p.m.

CVE-2021-21002

2021-06-2519:15:08

CWE-772

CERTVDE

web.nvd.nist.gov

cve-2021-21002

phoenix contact

fl comserver uni

modbus

denial of service

nvd

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS3

7.5

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

AI Score

7.2

Confidence

High

EPSS

0.001

Percentile

42.5%

JSON

In Phoenix Contact FL COMSERVER UNI in versions < 2.40 a invalid Modbus exception response can lead to a temporary denial of service.

Affected configurations

Nvd

Node

phoenixcontactfl_comserver_uni_232\/422\/485_firmwareRange<2.40

AND

phoenixcontactfl_comserver_uni_232\/422\/485Match-

Node

phoenixcontactfl_comserver_uni_232\/422\/485-t_firmwareRange<2.40

AND

phoenixcontactfl_comserver_uni_232\/422\/485-tMatch-

VendorProductVersionCPE
phoenixcontactfl_comserver_uni_232\/422\/485_firmware*cpe:2.3:o:phoenixcontact:fl_comserver_uni_232\/422\/485_firmware:*:*:*:*:*:*:*:*
phoenixcontactfl_comserver_uni_232\/422\/485-cpe:2.3:h:phoenixcontact:fl_comserver_uni_232\/422\/485:-:*:*:*:*:*:*:*
phoenixcontactfl_comserver_uni_232\/422\/485-t_firmware*cpe:2.3:o:phoenixcontact:fl_comserver_uni_232\/422\/485-t_firmware:*:*:*:*:*:*:*:*
phoenixcontactfl_comserver_uni_232\/422\/485-t-cpe:2.3:h:phoenixcontact:fl_comserver_uni_232\/422\/485-t:-:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
phoenixcontact	fl_comserver_uni_232\/422\/485_firmware	*	cpe:2.3:o:phoenixcontact:fl_comserver_uni_232\/422\/485_firmware::::::::
phoenixcontact	fl_comserver_uni_232\/422\/485	-	cpe:2.3:h:phoenixcontact:fl_comserver_uni_232\/422\/485:-:::::::*
phoenixcontact	fl_comserver_uni_232\/422\/485-t_firmware	*	cpe:2.3:o:phoenixcontact:fl_comserver_uni_232\/422\/485-t_firmware::::::::
phoenixcontact	fl_comserver_uni_232\/422\/485-t	-	cpe:2.3:h:phoenixcontact:fl_comserver_uni_232\/422\/485-t:-:::::::*

CNA Affected

[
  {
    "product": "FL COMSERVER",
    "vendor": "Phoenix Contact",
    "versions": [
      {
        "lessThan": "2.40",
        "status": "affected",
        "version": "UNI 232/422/485 (2313452)",
        "versionType": "custom"
      },
      {
        "lessThan": "2.40",
        "status": "affected",
        "version": "UNI 232/422/485-T (2904817)",
        "versionType": "custom"
      }
    ]
  }
]

References

cert.vde.com/en-us/advisories/vde-2021-022

Social References

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS3

7.5

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

AI Score

7.2

Confidence

High

EPSS

0.001

Percentile

42.5%

JSON

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