lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflow
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
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. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | lwIP | 2.1.0; 2.1.1; 2.1.2; 2.1.3; 2.2.0; 2.2.1 | — | No fix listed | CNA |
- lwIP Vendor— Affected 2.1.0; 2.1.1; 2.1.2; 2.1.3; 2.2.0; 2.2.1 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2026-8836
- 2026-10-03 Alias added: GHSA-3w8m-3w76-f6mh
References
Sources
- CVE-2026-8836 · CVE Program
- CVE-2026-8836 · NVD
- FIRST EPSS
- GHSA-3w8m-3w76-f6mh · GitHub Advisory Database · CC BY 4.0
- CVE-2026-8836 · Red Hat security data · CC BY 4.0
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