CVE-2025-11936

MEDIUM EPSS 31.8%
Published Nov 21, 20257mo ago · Modified Jun 17, 20262w ago
6.3 CVSS 4.0
Medium
Find Similar
Published Nov 21, 2025 7mo ago
Last Modified Jun 17, 2026 2w ago

Description

Improper input validation in the TLS 1.3 KeyShareEntry parsing in wolfSSL v5.8.2 on multiple platforms allows a remote unauthenticated attacker to cause a denial-of-service by sending a crafted ClientHello message containing duplicate KeyShareEntry values for the same supported group, leading to excessive CPU and memory consumption during ClientHello processing.

CVSS Details

Base Score
6.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/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 Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
31.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-20 Improper Input Validation Validation

Affected Products 1

VendorProductVersionRange
wolfsslwolfssl*≥5.8.2  –  <5.8.4

References 2

  • github.com https://github.com/wolfSSL/wolfssl
    Product
  • github.com https://github.com/wolfSSL/wolfssl/pull/9117
    Issue TrackingPatch

Remediation

  • github.com https://github.com/wolfSSL/wolfssl/pull/9117
    Issue TrackingPatch