CVE-2026-15340: CWE-120 in Savannah lwIP SMTP client
Description
CVE-2026-15340 is a critical buffer overflow vulnerability in the lwIP SMTP client from Savannah. The flaw arises because the client does not validate the size of input data, which can lead to memory corruption. This vulnerability has a CVSS score of 9.8, indicating high impact on confidentiality, integrity, and availability. The affected version is exactly 2.2.1. No patch or remediation information is currently provided, and no known exploits are reported in the wild.
CVSS v3.1
Score 9.8critical
Affected software
Savannah
lwIP SMTP client
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The lwIP SMTP client in Savannah version 2.2.1 contains a buffer overflow vulnerability (CWE-120) due to lack of input size validation. This can allow an attacker to overwrite memory, potentially leading to arbitrary code execution or denial of service. The vulnerability is rated critical with a CVSS 3.1 score of 9.8, reflecting network attack vector, low attack complexity, no privileges required, no user interaction, and full impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation could result in complete compromise of the affected system, including unauthorized disclosure, modification, or destruction of data, and disruption of service. Given the critical CVSS score, the impact is severe.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider mitigating exposure by restricting network access to the SMTP client or employing other compensating controls.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- icscert
- Date Reserved
- 2026-07-09T19:50:39.306Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac9026b2cdf04f656621289
Added to database: 10/09/2026, 15:04:11 UTC
Last enriched: 10/09/2026, 15:18:23 UTC
Last updated: 10/09/2026, 15:19:09 UTC
Views: 6
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