# CVE-2025-24371

## Summary

- **CVE ID:** CVE-2025-24371
- **Severity:** HIGH
- **CVSS Score:** 7.1 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-703
- **Published:** Feb 3, 2025
- **Last Modified:** Mar 12, 2026

## Description

CometBFT is a distributed, Byzantine fault-tolerant, deterministic state machine replication engine. In the `blocksync` protocol peers send their `base` and `latest` heights when they connect to a new node (`A`), which is syncing to the tip of a network. `base` acts as a lower ground and informs `A` that the peer only has blocks starting from height `base`. `latest` height informs `A` about the latest block in a network. Normally, nodes would only report increasing heights. If `B` fails to provide the latest block, `B` is removed and the `latest` height (target height) is recalculated based on other nodes `latest` heights. The existing code however doesn't check for the case where `B` first reports `latest` height `X` and immediately after height `Y`, where `X > Y`. `A` will be trying to catch up to 2000 indefinitely. This condition requires the introduction of malicious code in the full node first reporting some non-existing `latest` height, then reporting lower `latest` height and nodes which are syncing using `blocksync` protocol. This issue has been patched in versions 1.0.1 and 0.38.17 and all users are advised to upgrade. Operators may attempt to ban malicious peers from the network as a workaround.

## Affected Products

- cometbft — cometbft (< 0.38.17)
- cometbft — cometbft (= 1.0.0)

## References

- [CNA](https://github.com/cometbft/cometbft/security/advisories/GHSA-22qq-3xwm-r5x4)
- [CNA](https://github.com/cometbft/cometbft/releases/tag/v0.38.17)
- [CNA](https://github.com/cometbft/cometbft/releases/tag/v1.0.1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.46%
- **EPSS Percentile:** 38.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._