CVE-2020-8929

MEDIUM

Tink Java < 1.5.0 - Ciphertext ID Manipulation via Unicode Handling

Title source: llm
STIX 2.1

Description

A mis-handling of invalid unicode characters in the Java implementation of Tink versions prior to 1.5 allows an attacker to change the ID part of a ciphertext, which result in the creation of a second ciphertext that can decrypt to the same plaintext. This can be a problem with encrypting deterministic AEAD with a single key, and rely on a unique ciphertext-per-plaintext.

References (2)

Core 2

Scores

CVSS v3 5.3
EPSS 0.0046
EPSS Percentile 37.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Details

CWE
CWE-176
Status published
Products (2)
com.google.crypto.tink/tink 0 - 1.5.0Maven
google/tink_java < 1.5.0
Published Oct 19, 2020
Tracked Since Feb 18, 2026