CVE-2025-5520Public exploitNetwork attack vector

AMF and MME crash via stale UE context

Published Jun 3, 2025 · Updated Jun 3, 2025

Reachable assertions in Open5GS 2.7.0 through 2.7.3 allow remote attackers to crash AMF or MME through cellular signaling. After an incomplete handover deletes a RAN context, gmm_state_authentication and emm_state_authentication assert on a failed context lookup instead of handling NULL. Exploitation requires crafted handover and repeated registration traffic using a duplicate subscriber identity, causing a service-interrupting process abort.

CVSS severity6.9
Medium
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Reachable assertions in Open5GS 2.7.0 through 2.7.3 allow remote attackers to crash AMF or MME through cellular signaling. After an incomplete handover deletes a RAN context, gmm_state_authentication and emm_state_authentication assert on a failed context lookup instead of handling NULL. Exploitation requires crafted handover and repeated registration traffic using a duplicate subscriber identity, causing a service-interrupting process abort.

The record

CVE
CVE-2025-5520
Published
Jun 3, 2025
Updated
Jun 3, 2025
Vendor
Open5GS
Product
Open5GS
Classifications
CWE-617, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 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=2.7.0
  2. Affected versionversion=2.7.1
  3. Affected versionversion=2.7.2
  4. Affected versionversion=2.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open5GS · Open5GSversion=2.7.0; version=2.7.1; version=2.7.2; version=2.7.3

Published CVSS scores

5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
6.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P

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-617Reachable Assertion
T1499Endpoint Denial of Service

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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