CVE-2025-11931

LOW
2025-11-21 [email protected]
2.1
CVSS 4.0

CVSS Vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/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
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

3
Analysis Generated
Mar 28, 2026 - 19:23 vuln.today
Patch Released
Mar 28, 2026 - 19:23 nvd
Patch available
CVE Published
Nov 21, 2025 - 23:15 nvd
LOW 2.1

Tags

Integer Overflow Buffer Overflow Wolfssl

Description

Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wc_XChaCha20Poly1305_Decrypt() which is not used with TLS connections, only from direct calls from an application.

Analysis

Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. Rated low severity (CVSS 2.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

Technical Context

This vulnerability is classified under CWE-191. Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wc_XChaCha20Poly1305_Decrypt() which is not used with TLS connections, only from direct calls from an application. Affected products include: Wolfssl.

Affected Products

Wolfssl.

Remediation

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Priority Score

11
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +10
POC: 0

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CVE-2025-11931 vulnerability details – vuln.today
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