CVE-2024-46957Network attack vector

Authentication bypass via type-confused stanza matching

Published Sep 24, 2024 · Updated Sep 26, 2024

Authentication bypass in Mellium XMPP 0.0.1 through 0.21.4 allows remote attackers to spoof IQ responses with crafted XMPP stanzas. The response matcher correlates stanzas only by ID, so a message or presence stanza sharing an IQ ID reaches the IQ handler without a type check. Exploitation requires predictable custom IDs and a handler that does not recheck the type; the default ID generator avoids this condition.

CVSS severity9.3
Critical
EPSS probability0.61%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Mellium XMPP 0.0.1 through 0.21.4 allows remote attackers to spoof IQ responses with crafted XMPP stanzas. The response matcher correlates stanzas only by ID, so a message or presence stanza sharing an IQ ID reaches the IQ handler without a type check. Exploitation requires predictable custom IDs and a handler that does not recheck the type; the default ID generator avoids this condition.

The record

CVE
CVE-2024-46957
Published
Sep 24, 2024
Updated
Sep 26, 2024
Vendor
Mellium
Product
XMPP
Classifications
CWE-290
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 24, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 2024Record 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=0.0.1 <=0.21.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mellium · XMPPversion=0.0.1 <=0.21.4

Published CVSS scores

9.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing

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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