CVE-2025-11678

HIGH EPSS 18.6%

Published Oct 20, 20258mo ago · Modified Jun 17, 20261w ago

7.5 CVSS 4.0

High

Published Oct 20, 2025 8mo ago

Last Modified Jun 17, 2026 1w ago

Description

Stack-based Buffer Overflow in lws_adns_parse_label in warmcat libwebsockets allows, when the LWS_WITH_SYS_ASYNC_DNS flag is enabled during compilation, to overflow the label_stack, when the attacker is able to sniff a DNS request in order to craft a response with a matching id containing a label longer than the maximum.

CVSS Details

Base Score

7.5

Exploitability

—

Impact

—

Vector string

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector Adjacent

Attack Complexity Low

Privileges Required None

User Interaction P

Scope X

Threat Intelligence

EPSS Exploit Probability

18.6% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-121

References 2

libwebsockets.org https://libwebsockets.org/git/libwebsockets/commit?id=2bb9598562b37c942ba5b04bcde3f7fdf66a9d3a
nozominetworks.com https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11678

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.