lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflow
48Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 9.3epss 1.1%
from disclosure to weapon13 days
Published on NVDMay 18
1st PoC+13d
exploitation probability
1.1%top 36% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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: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
Affected products
n/a · lwIPpublic PoCs found — 1
githubgithub.com/Hunt-Benito/lwip-snmpv3-stack-overflow-cve-2026-8836-critical-embedded-rce★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
https://cgit.git.savannah.gnu.org/cgit/lwip.git/commit/?id=0c957ec03054eb6c8205e9c9d1d05d90ada3898chttps://github.com/lwip-tcpip/lwip/commit/0c957ec03054eb6c8205e9c9d1d05d90ada3898chttps://savannah.nongnu.org/bugs/?68055https://savannah.nongnu.org/bugs/?68194https://vuldb.com/cve/CVE-2026-8836https://vuldb.com/submit/829798https://vuldb.com/vuln/364474https://vuldb.com/vuln/364474/cti