CVE-2026-15340

9.3 CRITICAL 0.4% exploit odds No fix listed Memory safety

What it is

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

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 0.4% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2026-07-09 19:50 UTC ReservedThe CVE id was reserved by its CNA
2026-10-09 15:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-11 17:17 UTC Last updatedMost recent change to the record

Details

Published: 2026-10-09 15:17 UTC
Last modified: 2026-10-11 17:17 UTC
Exploit probability: 0.4% · EPSS, next 30 days
Weakness: CWE-120 · Classic buffer overflow
Record status: Awaiting Analysis

Attack profile CVSS 4.0 · 9.3

Attack vector: Network
Complexity: Low
Attack requirements: None
Privileges needed: None
User interaction: None
Confidentiality: High
Integrity: High
Availability: High

Raw vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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References

NVD record · CVE.org record