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CVE-2020-8929

19
FAUCET Score

CVE-2020-8929 describes a vulnerability in Google Tink's Java implementation (versions prior to 1.5) where invalid Unicode characters can be mishandled, allowing an attacker to alter a ciphertext's ID. This manipulation enables the creation of a second ciphertext that decrypts to the same plaintext, posing a risk to deterministic AEAD schemes relying on unique ciphertext-per-plaintext. The vulnerability has a CVSS score of 5.3 (Medium), indicating a network-based attack with low complexity and a potential impact of data integrity compromise. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.5.0CPE matchmatch criteria
cpe:2.3:a:google:tink_java:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.46%
Probability of exploitation in next 30 days
EPSS Percentile
37.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0046 is in the 23rd percentile among its peer group of 23,690 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: com.google.crypto.tink:tinkFixed in: 1.5.0

Vendor Advisories (1)

mavenGHSA-g5vf-v6wf-7w2rmedium

Ciphertext Malleability Issue in Tink Java

Oct 16, 2020

References

github.com / google/tink/commit/93d839a5865b9d950dffdc9d0bc99b71280a8899
PatchThird Party Advisory
github.com / google/tink/security/advisories/GHSA-g5vf-v6wf-7w2r
PatchThird Party Advisory