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
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.4$0-$5k0.00

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. There is no exploit available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability classified as very 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 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 are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 05/20/2026).

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). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.4

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

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
05/20/2026 +2 days VulDB entry last update

Sourcesinfo

Advisory: 68194
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2026-8836 (🔒)
GCVE (CVE): GCVE-0-2026-8836
GCVE (VulDB): GCVE-100-364474

Entryinfo

Created: 05/18/2026 16:29
Updated: 05/20/2026 05:23
Changes: 05/18/2026 16:29 (58), 05/20/2026 05:23 (2)
Complete: 🔍
Submitter: 0rbitingZer0
Cache ID: 216::103

Submitinfo

Accepted

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

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!