CVE-2021-20596
MELSEC-F Series PLC NULL Pointer Dereference Remote DoS
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.
INFO
Published Date :
July 22, 2021, 12:15 p.m.
Last Modified :
Aug. 2, 2021, 2:25 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
Affected Products
The following products are affected by CVE-2021-20596
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-20596.
| URL | Resource |
|---|---|
| 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 |
| https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-006_en.pdf | Patch Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-20596 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-20596 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Aug. 02, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://jvn.jp/vu/JVNVU94348759/index.html No Types Assigned https://jvn.jp/vu/JVNVU94348759/index.html Patch, Third Party Advisory Changed Reference Type https://us-cert.cisa.gov/ics/advisories/icsa-21-201-01 No Types Assigned https://us-cert.cisa.gov/ics/advisories/icsa-21-201-01 Third Party Advisory Changed Reference Type https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-006_en.pdf No Types Assigned https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-006_en.pdf Patch, Vendor Advisory Added CWE NIST CWE-476 Added CPE Configuration OR *cpe:2.3:o:mitsubishielectric:fx3u-enet-l_firmware:*:*:*:*:*:*:*:* versions up to (including) 1.14 *cpe:2.3:o:mitsubishielectric:fx3u-enet-p502_firmware:*:*:*:*:*:*:*:* versions up to (including) 1.14 *cpe:2.3:o:mitsubishielectric:fx3u-enet_firmware:*:*:*:*:*:*:*:* versions up to (including) 1.14 -
CVE Modified by [email protected]
Jul. 30, 2021
Action Type Old Value New Value Added Reference https://us-cert.cisa.gov/ics/advisories/icsa-21-201-01 [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-20596 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-20596
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.38 }} 0.09%
score
0.72974
percentile