CVE-2020-8929
MEDIUMDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 38% of all known CVEs.
References
Related Vulnerabilities
Other CWE-176 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2026-48618 | Medium | 6.5 | 3.2% | - | Fix |
| CVE-2024-24691 | Critical | 9.6 | 1.7% | - | Fix |
| CVE-2023-39213 | Critical | 9.6 | 1.4% | - | Fix |
| CVE-2024-47611 | Unscored | - | 0.8% | - | - |
| CVE-2024-43093 | High | 7.3 | 0.7% | KEV | - |
| CVE-2006-10002 | Medium | 7.5 | 0.6% | - | Fix |
Common questions
How do I fix CVE-2020-8929?
Upgrade tink java to 1.5.0 or later.
Is CVE-2020-8929 being actively exploited?
Not that we know of. CVE-2020-8929 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.46% is the estimated probability that it will be exploited in the next 30 days. That is higher than 38% of all scored CVEs.
How severe is CVE-2020-8929?
CVE-2020-8929 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2020-8929 affect?
Published advisories record a fix for tink java (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-06-05.