CVE-2026-8836
Deferred Deferred - Pending Action
Stack-Based Buffer Overflow in lwIP SNMPv3 USM Handler

Publication date: 2026-05-18

Last updated on: 2026-05-18

Assigner: VulDB

Description
A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue.
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Meta Information
Published
2026-05-18
Last Modified
2026-05-18
Generated
2026-06-10
AI Q&A
2026-05-19
EPSS Evaluated
2026-06-08
NVD
CVE-2026-8836
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
lwip lwip to 2.2.1 (inc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
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Executive Summary

This vulnerability exists in the lwIP library up to version 2.2.1, specifically in the function snmp_parse_inbound_frame within the snmpv3 USM Handler component. It occurs when the argument msgAuthenticationParameters is manipulated, leading to a stack-based buffer overflow. This means that an attacker can send specially crafted data to overflow the buffer on the stack, potentially causing unexpected behavior or allowing code execution.

The attack can be initiated remotely, meaning an attacker does not need local access to exploit this vulnerability.

A patch has been released to fix this issue, identified by the commit 0c957ec03054eb6c8205e9c9d1d05d90ada3898c.

Impact Analysis

Exploitation of this vulnerability can lead to a stack-based buffer overflow, which may allow an attacker to execute arbitrary code, cause a denial of service, or crash the affected system.

Since the attack can be performed remotely without any privileges or user interaction, it poses a high risk to systems using vulnerable versions of lwIP.

The CVSS scores indicate a critical severity level, with a maximum score of 10.0 in version 2.0 and very high scores in later versions, reflecting the potential for significant impact on confidentiality, integrity, and availability.

Mitigation Strategies

The immediate step to mitigate this vulnerability is to install the patch named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c that addresses the issue in the snmp_parse_inbound_frame function of lwIP.

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