CVE-2022-40890Public exploitNetwork attack vector

AMF crash via unchecked gNB context allocation

Published Sep 29, 2022 · Updated May 21, 2025

Resource exhaustion in the Open5GS AMF 2.4.10 and earlier allows remote attackers to crash the service through repeated SCTP connections. The AMF allocates and lists an amf_gnb_t for each accepted connection before enforcing the 64-gNB limit, while its address lookup includes the source port and treats connections from new ports as distinct gNBs. Network access to the AMF N2 SCTP interface is sufficient; exhausting the preallocated gNB context pool terminates the AMF and interrupts mobility management.

CVSS severity7.5
High
EPSS probability0.92%
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 the Open5GS AMF 2.4.10 and earlier allows remote attackers to crash the service through repeated SCTP connections. The AMF allocates and lists an amf_gnb_t for each accepted connection before enforcing the 64-gNB limit, while its address lookup includes the source port and treats connections from new ports as distinct gNBs. Network access to the AMF N2 SCTP interface is sufficient; exhausting the preallocated gNB context pool terminates the AMF and interrupts mobility management.

The record

CVE
CVE-2022-40890
Published
Sep 29, 2022
Updated
May 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-404, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 29, 2022CVE publishedPublication date reported by the CVE source.
  2. May 21, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS: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.

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

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 exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1499.004Endpoint Denial of Service: Application 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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