#VU49086 Comparison using wrong factors

Published: 2020-12-23 | Updated: 2021-01-06

Vulnerability identifier: #VU49086

Vulnerability risk: High


CVE-ID: CVE-2020-28052

CWE-ID: CWE-1025

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
The Bouncy Castle Crypto Package For Java
Universal components / Libraries / Libraries used by multiple products

Vendor: Legion of the Bouncy Castle Inc.


The vulnerability allows a remote attacker to brute-force password hashes.

The vulnerability exists due to comparison error in OpenBSDBCrypt.checkPassword() function in core/src/main/java/org/bouncycastle/crypto/generators/OpenBSDBCrypt.java when matching passwords with hashes. A remote attacker can pass an incorrect password that will be accepted as a valid one by the library, bypass authentication process and gain unauthorized access to the application that uses vulnerable version of Bouncy Castle.

Install updates from vendor's website.

Vulnerable software versions

The Bouncy Castle Crypto Package For Java: 1.65 - 1.66


External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

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