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.

• CWE-347
• CWE-347

• https://github.com/tendermint/tendermint/commit/480b995a31727593f58b361af979054d17d84340Patch, Third Party Advisory
• https://github.com/tendermint/tendermint/issues/4926Exploit, Issue Tracking, Third Party Advisory
• https://github.com/tendermint/tendermint/security/advisories/GHSA-6jqj-f58p-mrw3Exploit, Third Party Advisory
• https://github.com/tendermint/tendermint/commit/480b995a31727593f58b361af979054d17d84340Patch, Third Party Advisory
• https://github.com/tendermint/tendermint/issues/4926Exploit, Issue Tracking, Third Party Advisory
• https://github.com/tendermint/tendermint/security/advisories/GHSA-6jqj-f58p-mrw3Exploit, Third Party Advisory

Published

Jul 2, 2020

Last Modified

Jun 17, 2026

Status

Modified

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