lwIP up to 2.2.1 snmpv3 USM src/apps/snmp/snmp_msg.c snmp_parse_inbound_frame msgAuthenticationParameters stack-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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9.3$0-$5k0.43

Summaryinfo

A vulnerability described as critical has been identified in lwIP up to 2.2.1. Affected by this vulnerability is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Executing a manipulation of the argument msgAuthenticationParameters can lead to stack-based overflow. The identification of this vulnerability is CVE-2026-8836. The attack may be launched remotely. Furthermore, there is an exploit available. A patch should be applied to remediate this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.

Detailsinfo

A vulnerability classified as critical was found in lwIP up to 2.2.1. This vulnerability affects the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. The manipulation of the argument msgAuthenticationParameters with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is 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). As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was shared by Aaron Wasserman with Praetorian as 68055/68194. The advisory is available at savannah.nongnu.org. This vulnerability was named CVE-2026-8836. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a exploit are known.

An exploit has been developed by Aaron Wasserman. It is declared as proof-of-concept. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate. The vulnerability scanner Nessus provides a plugin with the ID 315227 (Linux Distros Unpatched Vulnerability : CVE-2026-8836), which helps to determine the existence of the flaw in a target environment.

Applying the patch 0c957ec03054eb6c8205e9c9d1d05d90ada3898c is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (315227). Additional details are provided at savannah.nongnu.org. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.3

VulDB Base Score: 9.8
VulDB Temp Score: 8.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Proof-of-Concept
Author: Aaron Wasserman

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 315227
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-8836

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 0c957ec03054eb6c8205e9c9d1d05d90ada3898c

Timelineinfo

05/18/2026 Advisory disclosed
05/18/2026 +0 days VulDB entry created
08/22/2026 +96 days VulDB entry last update

Sourcesinfo

Advisory: 68055/68194
Researcher: Aaron Wasserman
Organization: Praetorian
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2026-8836 (🔒)
GCVE (CVE): GCVE-0-2026-8836
GCVE (VulDB): GCVE-100-364474
scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔒

Entryinfo

Created: 05/18/2026 16:29
Updated: 08/22/2026 11:42
Changes: 05/18/2026 16:29 (58), 05/20/2026 05:23 (2), 08/22/2026 10:46 (16), 08/22/2026 11:42 (31)
Complete: 🔍
Submitter: 0rbitingZer0
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #829798: lwIP 2.1.0 Stack-based Buffer Overflow (by 0rbitingZer0)

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