CVE-2025-15687Public exploitNetwork attack vector

SMF crash via stale Diameter session assertion

Published Aug 12, 2026 · Updated Aug 12, 2026

Denial of service in Open5GS 2.7.0 through 2.7.6 allows remote authenticated users to crash the SMF with a delayed Gx CCA. smf_gx_cca_cb looks up the CCA Session-Id after its session has been deleted, then asserts that the returned session context exists and aborts the process when it does not. Reachability requires a configured Diameter Gx peer plus rapid UE detach and reattach with a delayed answer; the crash terminates active UE sessions until SMF recovery.

CVSS severityUnavailable
Unscored
EPSS probability0.36%
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 2.7.0 through 2.7.6 allows remote authenticated users to crash the SMF with a delayed Gx CCA. smf_gx_cca_cb looks up the CCA Session-Id after its session has been deleted, then asserts that the returned session context exists and aborts the process when it does not. Reachability requires a configured Diameter Gx peer plus rapid UE detach and reattach with a delayed answer; the crash terminates active UE sessions until SMF recovery.

The record

CVE
CVE-2025-15687
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
Open5GS
Product
Open5GS
Classifications
CWE-404, T1498
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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
  5. Affected versionversion=2.7.4
  6. Affected versionversion=2.7.5
  7. Affected versionversion=2.7.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open5GS · Open5GSversion=2.7.0; version=2.7.1; version=2.7.2; version=2.7.3; version=2.7.4; version=2.7.5; version=2.7.6

Published CVSS scores

4.0VulDBAV:N/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C
5.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
4.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
4.3VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1498Network 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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