VULNERABILITY INTELLIGENCE

CVE-2020-8929

CVSS score5.3 MEDIUM
EPSS probability0.46%
CISA KEVNot currently listed
Published2020-10-19
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

Weakness classification

  • CWE-176: Improper Handling of Unicode Encoding

Primary references