CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
83.5%
Successful exploitation of this vulnerability could allow an attacker to achieve remote code execution on the device via NTP server settings.
The following versions of FXC AE1021, a wireless LAN router, are affected:
3.2.1 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN OS COMMAND (‘OS COMMAND INJECTION’) CWE-78
FXC AE1021/AE1021PE versions 2.0.9 and prior are vulnerable to a code injection that could allow an authenticated user to achieve remote code execution via NTP server settings.
CVE-2023-49897 has been assigned to this vulnerability. A CVSS v3.1 base score of 8.0 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
Ryu Kuki, Takayuki Sasaki, and Katsunari Yoshioka of Yokohama National University reported this vulnerability to JPCERT/CC.
Chad Seaman and Larry Cashdollar of Akamai Technologies reported this vulnerability to CISA.
FXC released the following versions to address this vulnerability:
FXC recommends users apply the following settings:
For more information, see FXC’s publication.
For more information, see JPCERT/CC’s security advisory.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
CISA has received reports of this vulnerability being actively exploited.
This advisory contains a vulnerability that has an associated “Known Exploited Vulnerabilities” (KEV) entry. Refer to the following link to view the KEV entry: Known Exploited Vulnerabilities Catalog | CISA
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-49897
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-23-355-01
cwe.mitre.org/data/definitions/78.html
github.com/cisagov/CSAF
jvn.jp/en/vu/JVNVU92152057/
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=FXC%20AE1021/AE1021PE+https://www.cisa.gov/news-events/ics-advisories/icsa-23-355-01
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.cisa.gov/known-exploited-vulnerabilities-catalog
www.cisa.gov/resources-tools/resources/ics-recommended-practices
www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf
www.cisa.gov/topics/industrial-control-systems
www.cisa.gov/topics/industrial-control-systems
www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
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www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
www.fxc.jp/news/20231206
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