{ "document": { "acknowledgments": [ { "organization": "xchglabs", "summary": "reported this vulnerability directly to Savannah and then disclosed once the fix was released" } ], "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Disclosure is not limited", "tlp": { "label": "WHITE", "url": "https://www.cisa.gov/news-events/news/traffic-light-protocol-tlp-definitions-and-usage" } }, "lang": "en-US", "notes": [ { "category": "legal_disclaimer", "text": "This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).", "title": "Legal Notice and Terms of Use" }, { "category": "summary", "text": "Successful exploitation of this vulnerability could crash the device being accessed; a buffer overflow condition may allow remote code execution.", "title": "Advisory Summary" }, { "category": "other", "text": "Energy, Water and Wastewater Systems", "title": "Critical infrastructure sectors" }, { "category": "other", "text": "Worldwide", "title": "Countries/areas deployed" }, { "category": "other", "text": "Sweden", "title": "Company headquarters location" }, { "category": "general", "text": "CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Minimize network exposure for all control system devices and/or 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.", "title": "Recommended Practices" }, { "category": "general", "text": "CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.", "title": "Recommended Practices" }, { "category": "general", "text": "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.", "title": "Recommended Practices" }, { "category": "general", "text": "CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.", "title": "Recommended Practices" }, { "category": "general", "text": "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.", "title": "Recommended Practices" }, { "category": "general", "text": "Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.", "title": "Recommended Practices" } ], "publisher": { "category": "coordinator", "contact_details": "central@cisa.dhs.gov", "name": "CISA", "namespace": "https://www.cisa.gov/" }, "references": [ { "category": "self", "summary": "ICS Advisory ICSA-26-279-02 JSON", "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-279-02.json" }, { "category": "self", "summary": "ICSA Advisory ICSA-26-279-02 - Web Version", "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-279-02" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/resources-tools/resources/ics-recommended-practices" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/topics/industrial-control-systems" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/news-events/news/targeted-cyber-intrusion-detection-and-mitigation-strategies-update-b" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/secure-our-world/teach-employees-avoid-phishing" }, { "category": "external", "summary": "Recommended Practices", "url": "https://www.cisa.gov/news-events/news/avoiding-social-engineering-and-phishing-attacks" } ], "title": "Savannah lwIP SMTP client", "tracking": { "current_release_date": "2026-10-06T06:00:00.000000Z", "generator": { "date": "2026-10-05T21:13:37.355581Z", "engine": { "name": "CISA CSAF Generator", "version": "1.0.0" } }, "id": "ICSA-26-279-02", "initial_release_date": "2026-10-06T06:00:00.000000Z", "revision_history": [ { "date": "2026-10-06T06:00:00.000000Z", "legacy_version": "Initial", "number": "1", "summary": "Initial Publication" } ], "status": "final", "version": "1" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version", "name": "2.2.1", "product": { "name": "Savannah lwIP SMTP client: 2.2.1", "product_id": "CSAFPID-0001" } } ], "category": "product_name", "name": "lwIP SMTP client" } ], "category": "vendor", "name": "Savannah" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-15340", "cwe": { "id": "CWE-120", "name": "Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')" }, "notes": [ { "category": "summary", "text": "lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.", "title": "Vulnerability Summary" }, { "category": "details", "text": "SSVCv2/E:P/A:Y/2026-10-05T06:00:00.000000Z", "title": "SSVC" } ], "product_status": { "known_affected": [ "CSAFPID-0001" ] }, "references": [ { "category": "external", "summary": "cwe.mitre.org", "url": "https://cwe.mitre.org/data/definitions/120.html" }, { "category": "external", "summary": "www.cve.org", "url": "https://www.cve.org/CVERecord?id=CVE-2026-15340" }, { "category": "external", "summary": "www.first.org", "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H" }, { "category": "external", "summary": "www.first.org", "url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N" } ], "remediations": [ { "category": "mitigation", "details": "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)", "product_ids": [ "CSAFPID-0001" ] } ], "scores": [ { "cvss_v3": { "baseScore": 9.8, "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "products": [ "CSAFPID-0001" ] } ] } ] }