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Padding Oracle Hunter

Padding Oracle Hunter is a Burp Suite extension that helps penetration testers quickly identify and exploit the PKCS#7 and PKCS#1 v1.5 padding oracle vulnerability.


Currently, the extension consists of 2 separate tabs PKCS#7 and PKCS#1 v1.5, which support the following functionalities:

  • PKCS#7 - Identify and perform the padding oracle attack targeting the PKCS#7 padding scheme on CBC block cipher. The attack allows plaintext recovery and modification without knowing the key.
  • PKCS#1 v1.5 - Identify and perform the padding oracle attack targeting the PKCS#1 v1.5 padding scheme on RSA Cryptosystem. The attack allows the plaintext to be recovered with only the public key information.

For further usage instructions, please refer to the source GitHub repository

Author GovTech-CSG
Version 1.1
Last updated 23 March 2022

You can install BApps directly within Burp, via the BApp Store feature in the Burp Extender tool. You can also download them from here, for offline installation into Burp.

You can view the source code for this BApp by visiting our GitHub page.
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Please note that extensions are written by third party users of Burp, and PortSwigger Web Security makes no warranty about their quality or usefulness for any particular purpose.

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