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Fencer Intel
medium 6.5

CVE-2020-15091 json

Denial of Service in TenderMint

published 6y ago modified 4mo 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

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Exploit prediction

0.91% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-09).

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

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.