Vulnerability in Z.cash Zcash
CVE-2019-7167
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.022 (81.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.022 · change: +0.004
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- fortune.com/2019/02/05/zcash-vulnerability-cryptocurrency/ (Third Party Advisory, Press/Media Coverage)
- z.cash/blog/zcash-counterfeiting-vulnerability-successfully-remediated/ (Vendor Advisory)
- github.com/JinBean/CVE-Extension
Frequently asked questions
- What is CVE-2019-7167?
- CVE-2019-7167 is a high-severity vulnerability in Z.cash Zcash, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2019-03-27.
- How severe is CVE-2019-7167?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2019-7167 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.