Vulnerability in Tendermint
CVE-2020-15091
TenderMint from version 0.33.0 and before version 0.33.6 allows block proposers to include signatures for the wrong block. This may happen naturally if you start a network, have it run for some time and restart it (**without changing chainID**). A malicious block proposer (even with a minimal amount of stake) can use this vulnerability to completely halt the network. This issue is fixed in Tendermint 0.33.6 which checks all the signatures are for the block with 2/3+ majority before creating a commit.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (58.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Tendermint — versions >= 0.33.0, < 0.33.6
Weakness classification (CWE)
References
- github.com/tendermint/tendermint/security/advisories/GHSA-6jqj-f58p-mrw3 (Exploit, Third Party Advisory)
- github.com/tendermint/tendermint/issues/4926 (Exploit, Third Party Advisory, Issue Tracking)
- github.com/tendermint/tendermint/commit/480b995a31727593f58b361af979054d17d84340 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-15091?
- CVE-2020-15091 is a medium-severity vulnerability in Tendermint, classified under Improper Verification of Cryptographic Signature. CVSS score: 6.5/10. Published 2020-07-02.
- How severe is CVE-2020-15091?
- Medium severity. CVSS v3 base score is 6.5 out of 10.