Vulnerability details
CVE-2026-8836
lwIP lwIP
lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflow
CVSS 4.0
9.3Critical
Official 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. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulDB) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P |
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (VulDB) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C |
| 9.8Critical | 3.0 | CVEProject cvelistV5 (CNA) (VulDB) | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C |
| 10.0High | 2.0 | CVEProject cvelistV5 (CNA) (VulDB) | AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:OF/RC:C |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| lwIP | lwIP | 2.1.0 | CVEProject cvelistV5 (CNA) |
| lwIP | lwIP | 2.1.1 | CVEProject cvelistV5 (CNA) |
| lwIP | lwIP | 2.1.2 | CVEProject cvelistV5 (CNA) |
| lwIP | lwIP | 2.1.3 | CVEProject cvelistV5 (CNA) |
| lwIP | lwIP | 2.2.0 | CVEProject cvelistV5 (CNA) |
| lwIP | lwIP | 2.2.1 | CVEProject cvelistV5 (CNA) |
References and advisories
8- https://vuldb.com/vuln/364474 vdb-entrytechnical-description
- https://vuldb.com/vuln/364474/cti signaturepermissions-required
- https://vuldb.com/cve/CVE-2026-8836 third-party-advisory
- https://vuldb.com/submit/829798 third-party-advisory
- https://savannah.nongnu.org/bugs/?68055 broken-link
- https://cgit.git.savannah.gnu.org/cgit/lwip.git/commit/?id=0c957ec03054eb6c8205e9c9d1d05d90ada3898c broken-linkpatch
- https://github.com/lwip-tcpip/lwip/commit/0c957ec03054eb6c8205e9c9d1d05d90ada3898c patch
- https://savannah.nongnu.org/bugs/?68194 broken-link
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Details
- Published
- 2026-05-18
- Last updated
- 2026-08-22
- State
- Published
- Assigner (CNA)
- VulDB
Exploit prediction (EPSS)
1.09%
Probability of exploitation in 30 days
65.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-121Stack-based Buffer Overflow
- CWE-119Memory Corruption