CVE-2019-7167 json
Zcash, before the Sapling network upgrade (2018-10-28), had a counterfeiting vulnerability.
published 2019-03-27 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-16716
- cvss
- 7.5
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.2%
- EPSS 2.2% chance of exploitation in 30 days, percentile 82%
- public exploits
- 0
- none known
Summary
Zcash, before the Sapling network upgrade (2018-10-28), had a counterfeiting vulnerability. A key-generation process, during evaluation of polynomials related to a to-be-proven statement, produced certain bypass elements. Availability of these elements allowed a cheating prover to bypass a consistency check, and consequently transform the proof of one statement into an ostensibly valid proof of a different statement, thereby breaking the soundness of the proof system. This misled the original Sprout zk-SNARK verifier into accepting the correctness of a transaction.
Exploit prediction
2.18% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-754 Improper Check for Unusual or Exceptional Conditions
References
-
z.cash
/blog/zcash-counterfeiting-vulnerability-successfully-remediated/
vendor-advisory
-
fortune.com
/2019/02/05/zcash-vulnerability-cryptocurrency/
press/media-coverage, third-party-advisory
- github.com /JinBean/CVE-Extension
Sources
- CVE List CVE-2019-7167
- NVD CVE-2019-7167
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