CVE-2023-50020Public exploitNetwork attack vector

AMF crash via stale SCTP write event

Published Jan 2, 2024 · Updated Jun 18, 2025

Denial of service in Open5GS AMF 2.6.6 allows remote attackers to crash the service by disrupting an SCTP connection. The epoll event path preserves OGS_POLLOUT when EPOLLRDHUP arrives, so sctp_write_callback sends on the closed association and an unhandled SIGPIPE terminates AMF. The demonstrated trigger repeatedly stops and restarts a UE while cycling its gNB, interrupting 5G core access served by that AMF.

CVSS severity7.5
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Open5GS AMF 2.6.6 allows remote attackers to crash the service by disrupting an SCTP connection. The epoll event path preserves OGS_POLLOUT when EPOLLRDHUP arrives, so sctp_write_callback sends on the closed association and an unhandled SIGPIPE terminates AMF. The demonstrated trigger repeatedly stops and restarts a UE while cycling its gNB, interrupting 5G core access served by that AMF.

The record

CVE
CVE-2023-50020
Published
Jan 2, 2024
Updated
Jun 18, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 18, 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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS: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-400Uncontrolled Resource Consumption
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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