CVE-2020-15091 json
Denial of Service in TenderMint
published 2020-07-02 6 y ago modified 2026-07-08 4 mo ago also GHSA-6jqj-f58p-mrw3 , GO-2021-0090 , EUVD-2021-2459
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 60%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/tendermint/tendermint 0.33.6, 0.34.0-dev1.0.20200702134149-480b995a3172
- tendermint tendermint 0.33.6
- github.com/tendermint/tendermint@480b995 commit
- github.com/tendermint/tendermint#5426 pull request
Exploit prediction
0.91% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/tendermint/tendermint/security/advisories/GHSA-6jqj-f58p-mrw3 referenced PoC, tagged "exploit" by a source, unverified
- github.com https://github.com/tendermint/tendermint/issues/4926 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:N/I:N/A:P |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/tendermint/tendermint | <0.33.6 >=0.33.0, <0.34.0-dev1.0.20200702134149-480b995a3172 |
0.33.6 0.34.0-dev1.0.20200702134149-480b995a3172 |
Affected products
- tendermint tendermint
Classification
- Weakness
-
- CWE-347 Improper Verification of Cryptographic Signature
References
-
github.com
/tendermint/tendermint/commit/480b995a31727593f58b361af979054d17d84340
web, patch, third-party-advisory
-
github.com
/tendermint/tendermint/pull/5426
web, patch
-
github.com
/tendermint/tendermint/security/advisories/GHSA-6jqj-f58p-mrw3
web, exploit, third-party-advisory
-
github.com
/tendermint/tendermint/issues/4926
web, exploit, issue-tracking, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2020-15091
advisory
-
github.com
/tendermint/tendermint
package
-
github.com
/tendermint/tendermint/blob/master/CHANGELOG.md#v0336
web
-
pkg.go.dev
/vuln/GO-2021-0090
web
Sources
- CVE List CVE-2020-15091
- GitHub Advisory GHSA-6jqj-f58p-mrw3
- NVD CVE-2020-15091
- OSV GO-2021-0090
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