CVE-2025-11931
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-21

Last updated on: 2025-12-04

Assigner: wolfSSL Inc.

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.
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Meta Information
Published
2025-11-21
Last Modified
2025-12-04
Generated
2026-06-16
AI Q&A
2025-11-22
EPSS Evaluated
2026-06-15
NVD
CVE-2025-11931
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
wolfssl wolfssl 5.8.4
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-191 The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.
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Executive Summary

This vulnerability is an integer underflow that leads to out-of-bounds memory access in the XChaCha20-Poly1305 decryption function wc_XChaCha20Poly1305_Decrypt(). It occurs specifically when this function is called directly by an application, not during TLS connections.

Impact Analysis

The vulnerability could potentially allow an attacker to cause out-of-bounds memory access during decryption, which might lead to crashes or other unintended behavior in the affected application. However, the CVSS score is low (2.1), indicating limited impact and requiring user interaction and network attack vector.

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