by Kastro
Paper/Archive/CVE-2026-15340

CVE-2026-15340

Savannah lwIP SMTP client — Savannah lwIP SMTP client Classic Buffer Overflow

EPSS 0.4%CVSS 9.8
critical.is priorityof 100
36
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 30.5.305 × 206.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.

Affected

ProductAffectedFixed inSource
lwIP SMTP client2.2.1–CNA

Scores by source

icscert (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
icscert (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refcisa.gov/news-events/ics-advisories/icsa-26-279-02refgithub.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-279-02.json