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CVE-2025-24371— Malicious peer can make node stuck in blocksync in github.com/cometbft/cometbft

Quick assessment

Affected
cometbft cometbft
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CometBFT是CometBFT开源的一种拜占庭容错 (BFT) 中间件，它采用状态转换机（用任何编程语言编写）并可在许多机器上安全地复制。 CometBFT存在安全漏洞，该漏洞源于blocksync协议中未检查节点报告的latest高度递减的情况，导致同步节点无限期尝试追赶非存在的区块高度。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.46% · P40
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I. Basic Information for CVE-2025-24371

Vulnerability Information
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Vulnerability Title
Malicious peer can make node stuck in blocksync in github.com/cometbft/cometbft
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件检查或处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
CometBFT 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CometBFT是CometBFT开源的一种拜占庭容错 (BFT) 中间件，它采用状态转换机（用任何编程语言编写）并可在许多机器上安全地复制。 CometBFT存在安全漏洞，该漏洞源于blocksync协议中未检查节点报告的latest高度递减的情况，导致同步节点无限期尝试追赶非存在的区块高度。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cometbft cometbft < 0.38.17 -

II. Public POCs for CVE-2025-24371

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III. Intelligence Information for CVE-2025-24371

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Vendor Advisories for CVE-2025-24371 (1)

Vendor Pages for CVE-2025-24371 (1)

Other References for CVE-2025-24371 (1)

IV. Related Vulnerabilities

Same product: cometbft
Same vendor: cometbft
Same weakness: CWE-703