The Gentlemen ransomware: Dissecting a self-propagating Go encryptor

In this article 1. Pre-encryption 2. File encryption 3. Post-encryption 4. Defending against The Gentlemen ransomware 5. Microsoft Defender detections and hunting guidance 6. Indicators of compromise Ransomware that combines robust encryption with rapid lateral movement significantly increases th...

Potential Panic on Overlong Ciphertext Buffer

An application that passes in a ciphertext buffer of length greater than ptxt.len + TAGLEN to libcruxchacha20poly1305::encrypt or libcruxchacha20poly1305::xchacha20poly1305::encrypt would experience a panic. Impact An application where the length of the ciphertext buffer is under attacker control...

FreeBSD : wolfssl -- multiple issues (ba02dfb6-ce31-11f0-a327-589cfc01894a)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the ba02dfb6-ce31-11f0-a327-589cfc01894a advisory. wolfSSL blog reports: This release includes multiple fixes across TLS 1.2, TLS 1.3, X25519,...

Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt

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CVE-2025-11931

Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wcXChaCha20Poly1305Decrypt which is not used with TLS connections, only from direct calls from an application...

Linux Distros Unpatched Vulnerability : CVE-2025-11931

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function...

DEBIAN-CVE-2025-11931

Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wcXChaCha20Poly1305Decrypt which is not used with TLS connections, only from direct calls from an application...

CVE-2025-11931

Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wcXChaCha20Poly1305Decrypt which is not used with TLS connections, only from direct calls from an application...

CVE-2025-11931

Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wcXChaCha20Poly1305Decrypt which is not used with TLS connections, only from direct calls from an application...

UBUNTU-CVE-2025-11931

Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wcXChaCha20Poly1305Decrypt which is not used with TLS connections, only from direct calls from an application...

EUVD-2025-198522

Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wcXChaCha20Poly1305Decrypt which is not used with TLS connections, only from direct calls from an application...

CVE-2025-11931

The set of connected documents confirms this CVE affects wolfSSL’s XChaCha20-Poly1305 code, specifically the wc_XChaCha20Poly1305_Decrypt() function. The root cause is an integer underflow that can lead to out-of-bounds access when decrypting, and this path is taken from direct application calls ...

CVE-2025-11931

Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wcXChaCha20Poly1305Decrypt which is not used with TLS connections, only from direct calls from an application...

CVE-2025-11931 Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt

Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wcXChaCha20Poly1305Decrypt which is not used with TLS connections, only from direct calls from an application...

wolfSSL 安全漏洞

wolfSSL CyaSSL is a small, portable embedded SSL programming library for use by embedded systems developers from wolfSSL, Inc. in the United States. A security vulnerability exists in wolfSSL that stems from an integer underflow during the XChaCha20-Poly1305 decryption process, which could lead t...

PT-2025-47819

Name of the Vulnerable Software and Affected Versions Versions prior to 2025-11931 Description An integer underflow can lead to out-of-bounds access during decryption using XChaCha20-Poly1305. This occurs specifically when calling the wc XChaCha20Poly1305 Decrypt function, which is utilized by...

wolfssl -- multiple issues

wolfSSL blog reports: This release includes multiple fixes across TLS 1.2, TLS 1.3, X25519, XChaCha20-Poly1305, and PSK processing. Highlights include: A timing-side-channel issue in X25519 specifically affecting Xtensa-based ESP32 devices. Low-memory X25519 implementations are now the default fo...