CVE-2024-47522Network attack vector

Engine crash via malformed JA4 ALPN formatting

Published Oct 16, 2024 · Updated Apr 2, 2026

Reachable assertion in Suricata before 7.0.7 allows remote attackers to crash the engine with invalid ALPN in TLS or QUIC traffic. JA4 ALPN formatting can produce a 37-byte value that SCJA4GetHash copies into a 36-byte destination, and Rust rejects the unequal slice lengths. The crash requires JA4 matching or logging; QUIC JA4 is always enabled in affected builds, while TLS JA4 defaults to auto and activates when required.

CVSS severity7.5
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in Suricata before 7.0.7 allows remote attackers to crash the engine with invalid ALPN in TLS or QUIC traffic. JA4 ALPN formatting can produce a 37-byte value that SCJA4GetHash copies into a 36-byte destination, and Rust rejects the unequal slice lengths. The crash requires JA4 matching or logging; QUIC JA4 is always enabled in affected builds, while TLS JA4 defaults to auto and activates when required.

The record

CVE
CVE-2024-47522
Published
Oct 16, 2024
Updated
Apr 2, 2026
Vendor
Open Information Security Foundation
Product
Suricata
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 2026Record 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=< 7.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open Information Security Foundation · Suricataversion=< 7.0.7

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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