[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fdvdxRjfZCCYiqvZ0iexw8HfMDnLva39cThV8kFJVaRE":3},{"article":4,"iocs":44},{"id":5,"title":6,"slug":7,"summary":8,"ai_summary":9,"brief":10,"full_text":11,"url":12,"image_url":13,"published_at":14,"ingested_at":15,"relevance_score":16,"entities":17,"category_id":27,"category":28,"article_tags":31},"2015a503-fea7-47e7-8540-87a35f40ec8f","lwIP (Lightweight IP)","lwip-lightweight-ip-2830a7","View CSAF Summary Successful exploitation of this vulnerability could result in a system crash, a DoS, or memory corruption, which could lead to code execution on the victim system. The following versions of lwIP (Lightweight IP) are affected: API >=2.0.1| =2.0.1|\u003C=2.2.1 Product Status: known_affected Remediations Mitigation Users of lwIP are encouraged to update their version of lwIP using the repository found at https:\u002F\u002Fcgit.git.savannah.gnu.org\u002Fcgit\u002Flwip.git. The commit identifier that contains the fix is f873b6295933e4149a2132adf3e9a2d2a676a5ec. Relevant CWE: CWE-415 Double Free Metrics CVSS Version Base Score Base Severity Vector String 3.1 8.8 HIGH CVSS:3.1\u002FAV:A\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:U\u002FC:H\u002FI:H\u002FA:H 4.0 8.7 HIGH CVSS:4.0\u002FAV:A\u002FAC:L\u002FAT:N\u002FPR:N\u002FUI:N\u002FVC:H\u002FVI:H\u002FVA:H\u002FSC:N\u002FSI:N\u002FSA:N Acknowledgments Eric Evenchick of Tetrel Security reported this vulnerability to CISA. Legal Notice and Terms of Use This product is provided subject to this Notification (https:\u002F\u002Fwww.cisa.gov\u002Fnotification) and this Privacy & Use policy (https:\u002F\u002Fwww.cisa.gov\u002Fprivacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Minimize network exposure for all control system devices and\u002For systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices. 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\u002Fics. 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\u002Fics 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 also recommends users take the following measures to protect themselves from social engineering attacks: Do not click web links or open attachments in unsolicited email messages. Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. This vulnerability is not exploitable remotely. Revision History Initial Release Date: 2026-09-22 Date Revision Summary 2026-09-22 1 Initial Publication Legal Notice and Terms of Use","A critical vulnerability, CWE-415 Double Free, has been identified in lwIP (Lightweight IP) versions API >=2.0.1, =2.0.1, and \u003C=2.2.1. Successful exploitation could lead to system crashes, denial of service, memory corruption, and potentially code execution. CISA recommends updating lwIP to the fixed version identified by commit f873b6295933e4149a2132adf3e9a2d2a676a5ec and minimizing network exposure for affected systems.","lwIP (Lightweight IP) vulnerability allows for DoS, memory corruption, and potential code execution.","ICS Advisory lwIP (Lightweight IP) Release DateSeptember 22, 2026 Alert CodeICSA-26-265-02 Related topics: Industrial Control System Vulnerabilities , Industrial Control Systems View CSAF Summary Successful exploitation of this vulnerability could result in a system crash, a DoS, or memory corruption, which could lead to code execution on the victim system. The following versions of lwIP (Lightweight IP) are affected: API >=2.0.1|\u003C=2.2.1 (CVE-2026-91018) CVSS Vendor Equipment Vulnerabilities v3 8.8 lwIP lwIP (Lightweight IP) Double Free Background Critical Infrastructure Sectors: Chemical, Communications, Critical Manufacturing, Energy, Financial Services, Healthcare and Public Health, Transportation Systems, Water and Wastewater Systems Countries\u002FAreas Deployed: Worldwide Company Headquarters Location: Sweden Vulnerabilities Expand All + CVE-2026-91018 The affected product has a double free vulnerability, which could crash the system, cause a DoS, memory corruption, or allow code execution on the victim system. View CVE Details Affected Products lwIP (Lightweight IP) Vendor:lwIP Product Version:lwIP API: >=2.0.1|\u003C=2.2.1 Product Status:known_affected Remediations MitigationUsers of lwIP are encouraged to update their version of lwIP using the repository found at https:\u002F\u002Fcgit.git.savannah.gnu.org\u002Fcgit\u002Flwip.git. The commit identifier that contains the fix is f873b6295933e4149a2132adf3e9a2d2a676a5ec. Relevant CWE: CWE-415 Double Free Metrics CVSS Version Base Score Base Severity Vector String 3.1 8.8 HIGH CVSS:3.1\u002FAV:A\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:U\u002FC:H\u002FI:H\u002FA:H 4.0 8.7 HIGH CVSS:4.0\u002FAV:A\u002FAC:L\u002FAT:N\u002FPR:N\u002FUI:N\u002FVC:H\u002FVI:H\u002FVA:H\u002FSC:N\u002FSI:N\u002FSA:N Acknowledgments Eric Evenchick of Tetrel Security reported this vulnerability to CISA. Legal Notice and Terms of Use This product is provided subject to this Notification (https:\u002F\u002Fwww.cisa.gov\u002Fnotification) and this Privacy & Use policy (https:\u002F\u002Fwww.cisa.gov\u002Fprivacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Minimize network exposure for all control system devices and\u002For systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices. 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\u002Fics. 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\u002Fics 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 also recommends users take the following measures to protect themselves from social engineering attacks: Do not click web links or open attachments in unsolicited email messages. Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. This vulnerability is not exploitable remotely. Revision History Initial Release Date: 2026-09-22 Date Revision Summary 2026-09-22 1 Initial Publication Legal Notice and Terms of Use This product is provided subject to this Notification and this Privacy & Use policy. Tags Sector: Chemical Sector, Communications Sector, Critical Manufacturing Sector, Energy Sector, Financial Services Sector, Healthcare and Public Health Sector, Transportation Systems Sector, Water and Wastewater Systems Topics: Industrial Control System Vulnerabilities, Industrial Control Systems Please share your thoughts We recently updated our anonymous product survey; we welcome your feedback. Related Advisories Sep 22, 2026 ICS Advisory | ICSA-26-265-09 OpenPLC Runtime v3 Sep 22, 2026 ICS Advisory | ICSA-26-265-03 Siemens Siveillance Control Sep 22, 2026 ICS Advisory | ICSA-26-265-04 Siemens SIPLUS and SIMATIC Products Sep 22, 2026 ICS Advisory | ICSA-26-265-01 lwIP TCP\u002FIP Stack MQTT Client Application","https:\u002F\u002Fwww.cisa.gov\u002Fnews-events\u002Fics-advisories\u002Ficsa-26-265-02",null,"2026-09-22T12:00:00+00:00","2026-09-22T16:00:12.797676+00:00",8,[18,21,24],{"name":19,"type":20},"lwIP","product",{"name":22,"type":23},"Lightweight IP","technology",{"name":25,"type":26},"Savannah GNU","vendor","80544778-fabb-4dcd-aa35-17492e5dcf4f",{"id":27,"icon":13,"name":29,"slug":30},"Vulnerabilities","vulnerabilities",[32,37,39],{"category":33},{"id":34,"icon":13,"name":35,"slug":36},"26b0b636-0e31-4db1-bffb-61bdf9f20a58","Supply Chain","supply-chain",{"category":38},{"id":27,"icon":13,"name":29,"slug":30},{"category":40},{"id":41,"icon":13,"name":42,"slug":43},"d6f63bb8-0801-486a-be7f-171400700454","IoT\u002FOT","iot-ot",[45,49],{"type":46,"value":47,"context":48},"url","https:\u002F\u002Fcgit.git.savannah.gnu.org\u002Fcgit\u002Flwip.git","lwIP repository for updates",{"type":50,"value":51,"context":52},"hash_sha1","f873b6295933e4149a2132adf3e9a2d2a676a5ec","Commit identifier containing the fix"]