[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fPK0ZQRyJkA8xXNkVzbI2cLDVExsmqz3B2gUvW1qe1EI":3},{"article":4,"iocs":45,"watch_terms":54,"solutions":55,"lesson":145},{"id":5,"title":6,"slug":7,"summary":8,"ai_summary":9,"brief":10,"url":11,"image_url":12,"published_at":13,"ingested_at":14,"relevance_score":15,"entities":16,"category_id":28,"category":29,"article_tags":32},"c30bb22a-5b6d-41cb-8454-da660ea1575f","Savannah lwIP SMTP client","savannah-lwip-smtp-client-70be64","View CSAF Summary Successful exploitation of this vulnerability could crash the device being accessed; a buffer overflow condition may allow remote code execution. The following versions of Savannah lwIP SMTP client are affected: lwIP SMTP client 2.2.1 (CVE-2026-15340) CVSS Vendor Equipment v3 9.8 Savannah lwIP SMTP client 1 Vulnerability Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') Background Critical Infrastructure Sectors: Energy, Water and Wastewater Systems Countries\u002FAreas Deployed: Worldwide Company Headquarters Location: Sweden Vulnerabilities CVE-2026-15340 lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow. Read More 1 Affected Product Savannah lwIP SMTP client: 2.2.1 Product Status: known_affected Remediations Mitigation xchglabs reports that the vulnerability was fixed and released in the following patch: patch_125_smtp_txbuf.diff . This is available as available as git commit (614420f82c8729d070e01464c0dddb3c9525c772) Additional Metrics Relevant CWE: CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') CVSS Version Base Score Base Severity Vector String 3.1 9.8 CRITICAL CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:U\u002FC:H\u002FI:H\u002FA:H 4.0 9.3 CRITICAL CVSS:4.0\u002FAV:N\u002FAC:L\u002FAT:N\u002FPR:N\u002FUI:N\u002FVC:H\u002FVI:H\u002FVA:H\u002FSC:N\u002FSI:N\u002FSA:N View CVE Details Acknowledgments xchglabs reported this vulnerability directly to Savannah and then disclosed once the fix was released 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. Revision History Initial Release Date: 2026-10-06 Date Revision Summary 2026-10-06 1 Initial Publication Legal Notice and Terms of Use","A critical buffer overflow vulnerability (CVE-2026-15340) has been identified in Savannah's lwIP SMTP client version 2.2.1. Successful exploitation could lead to device crashes or remote code execution. The vulnerability affects critical infrastructure sectors like energy and water systems worldwide. A patch is available via a git commit.","Savannah lwIP SMTP client 2.2.1 vulnerable to buffer overflow, allowing RCE.","https:\u002F\u002Fwww.cisa.gov\u002Fnews-events\u002Fics-advisories\u002Ficsa-26-279-02",null,"2026-10-06T12:00:00+00:00","2026-10-06T18:00:11.996131+00:00",8,[17,20,23,26],{"name":18,"type":19},"lwIP SMTP client","product",{"name":21,"type":22},"Savannah","vendor",{"name":24,"type":25},"SMTP","technology",{"name":27,"type":25},"Buffer Overflow","80544778-fabb-4dcd-aa35-17492e5dcf4f",{"id":28,"icon":12,"name":30,"slug":31},"Vulnerabilities","vulnerabilities",[33,38,40],{"category":34},{"id":35,"icon":12,"name":36,"slug":37},"26b0b636-0e31-4db1-bffb-61bdf9f20a58","Supply Chain","supply-chain",{"category":39},{"id":28,"icon":12,"name":30,"slug":31},{"category":41},{"id":42,"icon":12,"name":43,"slug":44},"d6f63bb8-0801-486a-be7f-171400700454","IoT\u002FOT","iot-ot",[46,50],{"type":47,"value":48,"context":49},"cve","CVE-2026-15340","Vulnerability in Savannah lwIP SMTP 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Endpoint Firewall","https:\u002F\u002Fwww.threatlocker.com\u002Fcapabilities\u002Fzero-trust-endpoint-firewall","Centrally managed host firewall with device-level and dynamic access rules, to limit which machines can talk to each other.",{"vendor_slug":100,"vendor_name":101,"vendor_logo":102,"product_slug":103,"product_name":104,"url":105,"description":106},"illumio","Illumio","\u002Fvendor-logos\u002Fillumio.png","illumio-segmentation","Illumio Segmentation","https:\u002F\u002Fwww.illumio.com\u002Fillumio-segmentation","Maps traffic between workloads and enforces segmentation across data centre, cloud and endpoints.",{"vendor_slug":108,"vendor_name":109,"vendor_logo":110,"product_slug":111,"product_name":112,"url":113,"description":114},"akamai","Akamai","\u002Fvendor-logos\u002Fakamai.png","guardicore-segmentation","Akamai Guardicore Segmentation","https:\u002F\u002Fwww.akamai.com\u002Fproducts\u002Fakamai-guardicore-segmentation","Software-based microsegmentation with traffic 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networks.",{"vendor_slug":137,"vendor_name":138,"vendor_logo":139,"product_slug":140,"product_name":141,"url":142,"description":143},"dragos","Dragos","\u002Fvendor-logos\u002Fdragos.png","dragos-platform","Dragos Platform","https:\u002F\u002Fwww.dragos.com\u002Fcybersecurity-platform\u002F","OT asset visibility, threat detection and response guidance for industrial environments.",[],{"slug":146,"title":147,"body":148,"framework_refs":149,"framework_notes":160},"critical-buffer-overflow-in-lwip-smtp-client-threatens-critical-infrastructure","Critical Buffer Overflow in lwIP SMTP Client Threatens Critical Infrastructure","A critical buffer overflow vulnerability (CVE-2026-15340) in the Savannah lwIP SMTP client v2.2.1 exposes embedded systems in energy and water infrastructure to device crashes and remote code execution. The root cause lies in insufficient input validation within the SMTP client library, a common flaw in lightweight networking stacks used in resource-constrained IoT and industrial devices. This is particularly dangerous because lwIP is widely embedded across many devices, meaning the attack surface is broad and often overlooked. The availability of a patch via a git commit means organizations must act quickly, as threat actors routinely reverse-engineer patches to develop exploits shortly after disclosure.",[150,151,152,153,154,155,156,157,158,159],"CIS Control 2: Inventory and Control of Software Assets","CIS Control 7: Continuous Vulnerability Management","CIS Control 12: Network Infrastructure Management","NIST SP 800-82: Guide to ICS Security","NIST SI-2: Flaw Remediation","NIST SI-10: Information Input Validation","NIST CA-7: Continuous Monitoring","ICS-CERT Recommended Practices for Patch Management in ICS","NERC CIP-007-6: Systems Security Management (for energy sector)","NIST SP 800-161: Supply Chain Risk Management (SBOM guidance)",{}]