CVE-2023-42374Public exploitNetwork attack vector

Unauthenticated node crash via unbounded Snappy decompression

Published Feb 13, 2024 · Updated Apr 24, 2025

Resource exhaustion in Mysten Labs Sui before 1.6.3 allows remote attackers to crash validator and full nodes through P2P RPC messages. The anemo codec in crates/mysten-network/src/codec.rs reads each Snappy-compressed message fully into an unbounded buffer before BCS deserialization. Unauthenticated peers can send concurrent high-ratio messages to exhaust memory and terminate an individual node; published technical analysis does not substantiate arbitrary code execution.

CVSS severity9.8
Critical
EPSS probability1.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Mysten Labs Sui before 1.6.3 allows remote attackers to crash validator and full nodes through P2P RPC messages. The anemo codec in crates/mysten-network/src/codec.rs reads each Snappy-compressed message fully into an unbounded buffer before BCS deserialization. Unauthenticated peers can send concurrent high-ratio messages to exhaust memory and terminate an individual node; published technical analysis does not substantiate arbitrary code execution.

The record

CVE
CVE-2023-42374
Published
Feb 13, 2024
Updated
Apr 24, 2025
Vendor
Mysten Labs
Product
Sui
Classifications
CWE-94, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.6.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mysten Labs · Suiversion=0 <1.6.3

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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