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CVE-2025-27840 is a vulnerability affecting Espressif ESP32 chips in which 29 undocumented Bluetooth Host Controller Interface commands are exposed in production devices. Reported functionality includes commands capable of reading and writing memory, including RAM and flash, as well as lower-level Bluetooth controller operations such as packet injection and MAC address manipulation. The commands were described as internal debugging and test functionality within the Bluetooth HCI implementation, but their presence in deployed ESP32-based products creates an attack surface that can be abused to alter device state and behavior. Because ESP32 components are embedded across a wide range of smart and IoT products, the affected population is broad and not exhaustively enumerated.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (2 hidden).
This repository is a proof-of-concept (POC) exploit toolkit targeting cryptographic vulnerabilities in ESP32 microcontrollers (CVE-2025-27840), with a focus on attacks against Bitcoin wallets and related cryptographic operations. The codebase consists of Python scripts that demonstrate various cryptographic attacks, including: - Invalid private key acceptance due to missing lower bound checks (secp256k1_privkey_validator.py) - Signature forgery and message hash manipulation (bitcoin_sign_hash.py, calculate.py) - Invalid curve attacks and demonstration of ECC multiplication vulnerabilities (ecdsa_curve_attack.py) - Weak or predictable key generation (privkey_generate.py) - Exploitation of weak or custom RIPEMD160 hash implementations (ripemd160_vulnerability.py) - Recovery of private keys or public keys from weak ECDSA signatures (weak_key_recovery.py) - Conversion and manipulation of Bitcoin addresses and keys (priv_addr.py, wif_to_hash160.py) The repository includes sample data files (KEYFOUND.privkey, RawTX.txt) with example private keys and transactions. The main attack vectors are network-based (exploiting devices via Wi-Fi/Bluetooth) and local (attacking cryptographic operations on the device). The code is intended for research and demonstration purposes, highlighting the risks of insecure cryptographic implementations in IoT devices, especially those handling cryptocurrency wallets. No weaponized or automated exploitation is present, but the scripts provide a foundation for further development.
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31 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An ESP32 hardware vulnerability referenced as causing weak nonce generation, which in turn enabled recovery of cryptocurrency wallet private keys from ECDSA signatures.
An ESP32 hardware vulnerability cited as causing weak ECDSA nonce generation, enabling private key recovery from Bitcoin wallet signatures.
An ESP32 hardware vulnerability referenced as causing weak nonce generation, enabling private key recovery from affected Bitcoin wallet signatures.
A purported hardcoded private key vulnerability described as enabling private key recovery in Bitcoin-related software.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.