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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-05-18

Last Modified

2026-05-18

Generated

2026-06-30

AI Q&A

2026-05-19

EPSS Evaluated

2026-06-28

NVD

CVE-2026-8836

Affected Vendors & Products

Vendor	Product	Version / Range
lwip	lwip	to 2.2.1 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
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.
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).

Attack-Flow Graph

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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