CVE-2021-20596

CVSS V2 Medium 5 CVSS V3 High 7.5
Description
NULL Pointer Dereference in MELSEC-F Series FX3U-ENET firmware version 1.14 and prior, FX3U-ENET-L firmware version 1.14 and prior and FX3U-ENET-P502 firmware version 1.14 and prior allows a remote unauthenticated attacker to cause a DoS condition in communication by sending specially crafted packets. Control by MELSEC-F series PLC is not affected and system reset is required for recovery.
Overview
  • CVE ID
  • CVE-2021-20596
  • Assigner
  • Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-07-22T12:15:07
  • Last Modified Date
  • 2021-08-02T14:25:16
Weakness Enumerations
CWE URL
CWE-476 http://cwe.mitre.org/data/definitions/476.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
cpe:2.3:o:mitsubishielectric:fx3u-enet-l_firmware:*:*:*:*:*:*:*:* 1 OR 1.14
cpe:2.3:o:mitsubishielectric:fx3u-enet-p502_firmware:*:*:*:*:*:*:*:* 1 OR 1.14
cpe:2.3:o:mitsubishielectric:fx3u-enet_firmware:*:*:*:*:*:*:*:* 1 OR 1.14
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:L/Au:N/C:N/I:N/A:P
  • Access Vector
  • NETWORK
  • Access Compatibility
  • LOW
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • NONE
  • Availability Impact
  • PARTIAL
  • Base Score
  • 5
  • Severity
  • MEDIUM
  • Exploitability Score
  • 10
  • Impact Score
  • 2.9
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • LOW
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • NONE
  • Availability Impact
  • HIGH
  • Base Score
  • 7.5
  • Base Severity
  • HIGH
  • Exploitability Score
  • 3.9
  • Impact Score
  • 3.6
References
Reference URL Reference Tags
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-006_en.pdf Patch Vendor Advisory
https://jvn.jp/vu/JVNVU94348759/index.html Patch Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-201-01 Third Party Advisory
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2021-20596
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20596
History
Created Old Value New Value Data Type Notes
2022-05-10 06:58:47 Added to TrackCVE
2022-12-05 06:46:02 2021-07-22T12:15Z 2021-07-22T12:15:07 CVE Published Date updated
2022-12-05 06:46:02 2021-08-02T14:25:16 CVE Modified Date updated
2022-12-05 06:46:02 Analyzed Vulnerability Status updated